Computer Acronyms

A



• A-D Analog to Digital
• AA Author's Alteration
• AA Auto Answer
• AAL5 ATM Adaption Layer 5
• ABEND Abnormal End
• ABI Application Binary Interface
• ABR Available Bit Rate
• AC97 Audio Codec 97
• ACB Access method Control Block
• ACDS Active Control Data Set
• ACE Asynchronous Communications Element
• ACF Advanced Communication Facility
• ACIA Asynchronous Communications Interface Adapter
• ACK Acknowledge
• ACS Asynchronous Connection Server
• ACS Automatic Class Selection
• ACSE Application Control Service Element
• ACT Application Control Table
• ACU Automatic Calling Unit
• ADC Analog Digital Converter
• ADDMD Administrative Directory Management Domain
• ADMD Administrative Management Domain
• ADO ActiveX Data Object
• ADSL Asymetric Digital Subscriber Line
• AEA Activity End Acknowledge
• AEI Application Entity Invocation
• AF Application Framework
• AFP Advanced Function Printing
• AGP Accellerated Graphics Port
• AGS Advanced Graphics System
• AI Artificial Intelligence
• AIU Application Interface Unit
• AIX Advanced Interactive eXecutive
• AIX Alternate IndeX
• ALGOL ALGOrithmic Language
• ALS Application Layer Structure
• ALS Automatic Line Switching
• ALT Application Load Table
• ALU Arithmetic and Logic Unit
• AM Access Method
• AMH Automated Material Handling
• AMI Alternate Mark Inversion
• AMIS Audio Messaging Interchange Specification
• AMR Audio Modem Riser
• AMS Access Method Services
• ANR Automatic Network Routing
• ANS Advanced Network Services
• ANSI American National Standards Institute
• AOCE Apple Open Collaboration Environment
• AOW Asian and Oceanic Workshop for open systems
• AP Access Point
• AP Automation Protocol
• APA All Points Addressable
• APDU Application Protocol Data Unit
• API Application Programming Interface
• APIA API Association
• APL A Programming Language
• APPC Advanced Program-to-Program Communication
• APPI Advanced Peer-to-Peer Internetwork(ing)
• APPN Advanced Peer-to-Peer Network(ing)
• APS Advanced Production System
• AR Attention Routine
• ARP Address Resolution Protocol
• ARPA Advanced Research Projects Agency
• ARPANET Advanced Research Projects Agency Network
• ARU Audio Response Unit
• AS Activity Start
• AS Autonomous System
• ASC Accredited Standards Committee
• ASCII American Standard Code for Information Interchange
• ASE Application Service Element
• ASIC Application-Specific Integrated Circuit
• ASN Abstract Syntax Notation
• ASN.1 Abstract Syntax Notation One
• ASO Application Service Object
• ASR Automatic Speech Recognition
• ASTs Asynchronous System Traps
• AT Advanced Technology
• ATM Adobe Type Manager
• ATM Asynchronous Transfer Mode
• ATM Automatic Teller Machine
• ATMP Ascend Tunnel Management Protocol
• ATSF Alert Transport Service Facility
• AU Access Unit
• AVR Automatic Volume Recognition
• AWG American Wire Gauge

B



• B8ZS Binary Eight Zero Substitution
• BABT British Approvals Board for Telecommunications
• BAL Business Application Language
• BAM Basic Access Methods
• BAS Basic Activity Subset
• BASH Bourne-Again SHell
• BASIC Beginners All-Purpose Symbolic Instruktion Code
• BBS Bulletin Board System
• BCC Block Check Character
• BCD Binary Coded Decimal
• BCF Bridge Control Facility
• BCPL Basic Combined Programming Language
• BCS Basic Catalog Structure
• BCS Basic Combined Subset
• BDAM Basic Direct Access Method
• BDR Basic Density Range
• BEL Bell
• BER Bit Error Rate
• BES Bursty Errored Seconds
• BG BackGround
• BHT Branch History Table
• BIOS Basic Input/Output System
• BIS Business Information System
• BISYNC Binary Synchronous Communication
• BIT Binary Digit
• BITNIC Bitnet Network Information Center
• BLOB Binary Large Object
• BMIC Bus Master Interface Controller
• BMP BitMaP
• BMS Basic Mapping Support
• BNN Boundary Network Node
• BOC Bell Operating Companies
• BOT Begin Of Tape
• BP Base Pointer
• BPAM Basic Partitioned Access Method
• BPI Bytes Per Inch
• BPS Bites Per Second
• BRA Basic Rate Access
• BRI Basic Rate Interface
• BS Backspace / British Standard
• BSA Basic Service Area
• BSAM Basic Sequential Access Method
• BSC Binary Synchronous Communication
• BSD Berkeley Software Distribution
• BSDS BootStrap Data Set
• BSI British Standards Institute
• BSS Basic Synchronous Subset
• BTAC Branch Target Address Cache
• BTAM Basic Teleprocessing Access Method
• BTA-ES Basic Teleprocessing Access Method - Extended Storage
• BYP Bypass

C



• CA Collision Avoidance
• CA... Computer Aided ...
• CAA Computer Aided Architecture
• CAD Computer Aided Design
• CADD Computer Aided Design and Drafting
• CADIS Computer Aided Design Interactive System
• CAE Common Application Environment
• CAE Computer Assisted Education, Computer Aided Engineering = CAD +
• CAP + CAQ
• CAH Computer Aided Handling
• CAI Computer Aided Instruction = CIM + CAO
• CAISE Computer Aided Integrated Software Engineering
• CALS Computer Aided Acquisition and Logistic Support
• CAM Computer Aided Manufacturing / Content Adressable Memory
• CAMAC Computer Automated MeAsurement Control
• CAN Cancel
• CAO Computer Aided Office
• CAP Computer Aided Planning / Computer Aided Publishing
• CAPP Computer Aided Production Planning
• CAPPC Computer Aided Production Planning and Control
• CAPSC Computer Aided Production Scheduling and Control
• CAQ Computer Aided Quality Assurance
• CAR Computer Aided Roboting
• CAR Computer Assisted Radiology
• CAS Computer Aided Selling
• CASE Common Application Service Elements
• CASE Computer Aided Software-Engineering
• CAT Computer Aided Testing
• CATV CAble TeleVision
• CBDS Connectionless Broadband Data Service
• CBEMA Computer and Business Equipment Manufacturers' Association
• CBR Constant Bit Rate
• CBT Computer Based Training
• CCD Charge-Coupled Device
• CCETT Centre Commun d'Etudes de Telediffusion et Telecommunications
• CCIR International Radio Consultative Committee
• CCITT Comite Consultatif International Telegraphique et Telephonique
• CCR Committment, Concurrency and Recovery
• CCS Common Communication Support
• CCTA Central Computer and Telecommunications Agency
• CCU Communication Control Unit
• CCW Channel Command Word
• CD Collision Detection
• CD Compact Disk
• CDB Command Descriptor Block
• CDC Century Date Change
• CDDA Compact Disk - Digital Audio
• CDDI Copper Data Distribution Interface
• CDE Common Desktop Environment
• CDG Compact Disk - Graphic
• CDI Compact Disk Interactive
• CDMA Code Division Multiple Access
• CDPD Cellular Digital Packet Data
• CDR Copy Density Range
• CDROM Compact Disk ROM
• CDTV Commodore Total Vision
• CDXA Copmact Disk eXtended Architecture
• CEC Commission of European Communities
• CEFIC Conseil Européen des Federations de l'Industrie Chimique
• CELP Code Excited Linear Prediction
• CEN Comité Européen de Normalisation
• CENELEC Comité Européen de Normalisation Electrotechnique
• CEO Comprehensive Electronic Office
• CEPT Conference Européenne des Administrations des Postes et
• des Telecommunications
• CERN Conseil Européen pour la Recherche Nucléaire
• CF Call Forwarding
• CF Carry Flag
• CF Control Function
• CFV Call For Votes
• CGA Colour Graphics Adapter
• CGI Common Gateway Interface
• CGI Computer Graphics Interface
• CGM Computer Graphics Metafile
• CHAP Challenge-Handshake Authentication Protocol
• CHL-I CHanneL Interface
• CHPID CHannel Path IDentifier
• CI Computer Interconnect
• CI Control Interval
• CIAM Computer Integrated and Automated Manufacturing
• CIB Computer Integrated Business
• CICS Customer Information Control System
• CID Configuration, Installation and Distribution
• CIF Cells In Frames
• CIF Common Intermediate Format
• CIF Computer Integrated Factory = CIO + CIM
• CIM Computer Input by Microfilm
• CIM Computer Integrated Manufacturing = PPS + CAE + CAM
• CIO Computer Integrated Office
• CIR Committed Information Rate
• CIS Card Information Structure
• CISC Complex (Complete) Instruction Set Computer
• CIT Computer Integrated Telephony
• CIV Conversation Verb Interface
• CKD Count Key Data
• CL Core Image Library
• CL Connectionless
• CLI Call Level Interface
• CLIM Compaq/Lotus/Intel/Microsoft
• CLNS Connectionless Network Service
• CM/2 Communication Manager / 2
• CMC Communication Management Configuration
• CMEA Council for Mutual Economic Assistance
• CMIP Common Management Information Protocol
• CMIS Common Management Information Service
• CMOS Cellular Management Operation System
• CMOS Complimentary Metal Oxide Semiconductor
• CMOT Common Management Information Protocol (CMOT) Over TCP/IP
• CMR Communications Resource Manager
• CMS Conversational Monitor System
• CMYK Cyan, Magenta, Yellow, Black
• CN Corporate Network
• CNC Computerized Numerical Control
• CNLP Connectionless Network Protocol
• CNM Communication Network Management
• CNMA Communication Network for Manufacturing Applications
• CNR Carrier-to-Noise-Ratio
• COBOL COmmon Business Oriented Language
• COCOM Coordinating Comittee on Multilateral Export Controls
• CODASYL COnference on DAta SYstems Languages
• Codec Coder/Decoder
• COFF Common Object File Format
• COM Common Object Model
• COM Computer Output on Microfilm
• COMAL COMmon Algorithmic Language
• COMREG Communication Region
• CONS Connection-Oriented Network Service
• CORBA Common Object Request Broker Architecture
• COS Corporation for Open Systems
• COSE Common Open Software Environment
• COSINE Cooperation for OSI Networking in Europe
• COSS Cross Operating System Service
• CP Control Program
• CP-SVR Control Point to Server
• CP/M Control Program/Monitor (for Microcomputer)
• CPE Customer Premises Equipment
• CPI Characters Per Inch
• CPI Common Programming Interface
• CPI Computer to PABX Interface
• CPIC Common Programming Interface for Communications
• CPL Current Privilege Level
• CPR Computerized Patient Record
• CPS Characters Per Second
• CPU Central Processing Unit
• CR Carriage Return
• CR Communication Region
• CRC Cyclic Redundancy Check
• CRJE Conversational Remote Job Entry
• CRS Computer Reservation System
• CRS Configuration Report Server
• CRT Cathode Ray Tube
• CS Communications Server
• CSA Common System Area
• CSC Cross System Consistency
• CSDN Circuit Switched Data Network
• CSECT Control Section
• CSI Consolidated Software Inventory
• CSLIP Compressed SLIP
• CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
• CSMA/CD Carrier Sense Multiple Access with Collision Detection
• CSP Control Sequence Prefix
• CSP Cross System Product
• CSPDN Circuit Switched Public Data Network
• CST Computer Supported Telephony
• CSU Channel Service Unit
• CSU/DSU Channel Service Unit / Data Service Unit
• CT Continuous Tone
• CT2T Continuous Tone To Tape
• CTC Channel To Channel
• CTC CICS To CICS
• CTS Clear To Send
• CTS Conformance Test System
• CTS-WAN Conformance Testing Services for WAN
• CU Control Unit
• CUA Common User Access
• CUT Control Unit Terminal
• CVOL Control VOLume
• CWS Coalition for Working Systems

D



• D/A Digital/Analog
• DA Desk Accessory
• DAC Digital Analog Converter
• DAC Dual Attachment Concentrator
• DAI Distributed Artificial Intelligence
• DAM Direct Access Method
• DAP Directory Access Protocol
• DAP Document Application Profile
• DARPA Defense Advanced Research Projects Agency
• DAS Dual Attachment Station
• DASD Direct Access Storage Device
• DAT Digital Audio Tape
• DAT Dynamic Address Translation
• DB Database
• DBCS Double Byte Character Set
• DBMS DataBase Management System
• DBRT Directed Beam Refresh Terminal
• DC Data Cartridge
• DC Data Communication
• DCA Document Content Architecture
• DCAF Distributed Console Access Facility
• DCB Data Control Block
• DCB Disk Coprocessor Board
• DCC Diskette Controller Chip
• DCE Data Circuit terminating Equipment
• DCE Data Communications Equipment
• DCE Distributed Computing Environment
• DCI Display Control Interface
• DCL Digital Command Language
• DCS Desktop Color Separation
• DCT Destination Control Table
• DCT Discrete Cosine Transform
• DD Data Definition
• DDCMP Digital Data Communications Message Protocol
• DDCS Distributed Database Connecion Services/2
• DDE Dynamic Data Exchange
• DDES Digital Data Exchange Specifications
• DDI Device Driver Interface
• DDK Driver Development Kit
• DDL Data Definition Language
• DDL Document Description Language
• DDM Distributed Data Management
• DDN Defense Data Network
• DDP Distributed Data Processing
• DDRM Device driver interface/Driver kernel interface
• Reference Manual
• DDS Dataphone Digital Service
• DDS Decision Support System
• DECT Digital European Cordless Telephone
• DECUS Digital Equipment Computer Users Society
• DEL Delete
• DES Data Encryption Standard
• DF Direction Flag
• DFC Distributed Coordination Function
• DFDSS Data Facility Data Set Services
• DFHSM Data Facility Hierarchical Storage Manager
• DFP Data Facility Product
• DFR Document Filing and Retrival
• DFS Distributed File System
• DFSMS Data Facility Storage Management Subsystem
• DFSORT Data Facility Sort
• DFT Distributed Function Terminal
• DFWMAC Distributed Foundation Wireless Media Access Control
• DHCP Dynamic Host Configuration Protocol
• DIA Document Interchange Architecture
• DIB Data Input Bus
• DIB Device Independent Bitmap
• DIFS Distributed coordination function InterFrame Space
• DIMM Dual Inline Memory Module
• DIP Dual Inline Package
• DIS Draft International Standard
• DISSOS Distributed Office Support System
• DIT Directory Information Tree
• DKI Driver Kernel Interface
• DL Data Length
• DL Directory Listing
• DL/1 Data Language 1
• DLBL Disk Label
• DLCI Data Linc Connection Identifier
• DLE Data Link Escape
• DLL Dynamic Link Library
• DLS Device Level Selection
• DLSE Device Level Selection Enhanced
• DLSw Data Link Switching
• DLUR Dependent LU Requester
• DLUR/S Dependent LU Requester / Server
• DLUS Dependent LU Server
• DMA Direct Memory Access
• DMCI Direct Memory Communications Interface
• DMD Directory Management Domain
• DMI Digital Multiplexed Interface
• DML Data(base) Manipulation Language
• DMNL Direct Multi Network Link
• DMP Dot Matrix Printer
• DN Distinguished Name
• DNA Digital Network Architecture
• DNS Domain Name Service
• DOC Display Operator Console
• DOE Distributed Objects Everywhere
• DOMF Distributed Object Management Facility
• DOS Declaration Of Support
• DOS Disk Operating System
• DOS/VS Disk Operating System / Virtual Storage
• DOS/VSE Disk Operating System / Virtual Storage Extended
• DP Data Processing
• DP Draft Proposal
• DPA Document Printing Application
• DPF Data Private Facility
• DPI Dots Per Inch
• DPL Descriptor Privilege Level
• DPMS Display Power Management Signaling
• DPS Dynamic Path Selection
• DQDB Distributed Queue Dual Bus
• DRAM Dynamic Random Access Memory
• DRQ Data ReQuest
• DS Digit Select
• DS Directory System
• DSA Directory System Agent
• DSA Distributed Systems Architecture
• DSA Dynamic Storage Area
• DSF Device Support Facility
• DSL Direct Swift Link
• DSN DataSetName
• DSN Distributed Systems Network
• DSNL Direct Swift Network Link
• DSOM Distributed System Object Model
• DSP Digital Signal Processor
• DSP Directory System Protocol
• DSR Data Set Ready
• DSSI Digital Storage Systems Interconnect
• DSU Data Service Unit
• DTAM Document Transfer, Access and Manipulation
• DTD Document Type Definition
• DTE Data Terminal Equipment
• DTI Department of Trade and Industry (UK)
• DTP DeskTop Publishing
• DTR Data Terminal Ready
• DU Data Unit
• DUA Directory User Agent
• DUN Dispatch Unit Number
• DVI Digital Video Interface
• DVST Direct View Bistable Storage
• DXI Data eXchange Interface

E



• E1 2,048 Mbps
• E3 34 Mbps
• EARN European Academic and Research Network
• EB Error Bell
• EB ExaByte (1,152,921,504,606846,976 bytes)
• EBAM Electronic Beam-Addressable Memory
• EBCD Extended Binary Coded Decimal
• EBCDIC Extended Binary Coded Decimal Interchange Code
• ECC Error Checking and Correction
• ECC Error Correction Code
• ECE Economic Commission for Europe
• ECF Enhanced Connectivity Facility
• ECITC European Committee fo IT Testing and Certification
• ECKD Extended Count-Key Data
• ECMA European Computer Manufacturers Association
• ECTUA European Counsil for Telecommunications Users Association
• EDC Enterprise Database Connectivity
• EDF Execution Diagnostic Facility
• EDG Electronic Dot Generation
• EDI Electronic Data Interchange
• EDICON EDI Community for the Construction Industry (UK)
• EDIF Electronic Design Interchange Format
• EDIFACT Electronic Data Interchange For Administration, Commerce and
• Transport
• EDIM Electronic Data Interchange Message
• EDIMS EDI Messaging System
• EDM Engineering Data Management
• EDP Electronic Data Processing
• EDR Early Device Release
• EEMA European Electronic Mail Association
• EFT Electronic Funds Transfer
• EGA Enhanced Graphics Adapter
• EGP Exterior Gateway Protocol
• EHLLAPI Emulator High Level Language Applications Programming Interface
• EIB Execute Interface Block
• EIP Execute Interface Program
• EISA Extended Industry Standard Architecture
• EIT Encoding Information Type
• EIUF European ISDN User Forum
• ELAN European LAN
• ELAN Extended LAN
• ELAN Emulated LAN
• EM End of Medium
• EMA Enterprise Management Architecture
• EMS Expanded Memory Specification
• EMUG European MAP Users Group
• EN European Norme
• ENE Enterprise Network Event
• ENP Enable Presentation
• ENQ Enquiry
• EO Eight Ones
• EOB End of Block
• EOC End of Cylinder
• EOF End of File
• EOJ End of Job
• EOP End of Procedure
• EOT End of Transmission
• EOV End of Volume
• EP Emulation Program
• EPDE Electronic Product Data Exchange
• EPOW Emergency Power Off Warning
• EPROM Eraseable Programable Read Only Memory
• EPS Encapsulated PostScript
• EPSF Encapsulated PostScript Format
• ER Entity Relationship
• ERDS Error Recording Data Set
• EREP Environmental Record Editing and Printing program
• ES Errored Second
• ESA Extended Service Area
• ESC Escape
• ESCON Enterprise System Connection Architecture
• ESD Electronic Software Distribution
• ESD External Symbol Dictionary
• ESDI Enhanced Small Device Interface
• ESDS Entry Sequenced Data Set
• ESF Extended SuperFrame
• ESPRIT European Strategic Programme for Research and development in
• Information Technology
• ESQA Extended System Queue Area
• ETB End of Transmission Block
• ETCOM European Testing and Certification for Office and
• Manufacturing protocols
• ETS European Telecommunication Standard
• ETSI European Telecommunication Standards Institute
• ETX End of Text
• EUnet European Unix Network
• EUUG European Unix User Group
• EVI EVent Information
• EWOS European Workshop for Open Systems
• EXCP EXecute Channel Program
• EZ Excessive Zeros

F



• F/STP Foil STP
• FA Foreign Agent
• FAQ Frequently Asked Questions
• FAST Federation Against Software Theft
• FAT File Allocation Table
• FBA Fix Block Architecture
• FBA Fixed Blocked ANSI-defined printer control characters
• FBM Fix Block Modus
• FC File Control
• FCB Format Control Buffer
• FCP File Control Program
• FCS Frame-Check Sequence
• FCT File Control Table
• FDD Fixed Disk Drive
• FDDI Fiber Distributed Data Interface
• FEAL Fast Data Encipherment Algorithm
• FEP Front-End Processor
• FF Formfeed
• FH Frame Handler
• FIFO First In, First Out
• FIPS Federal Information Processing Standard
• FLOPS Floating-point operations per second
• FMLI Forms and Menu Language Interpreter
• FOB Form Overlay Buffer
• FOND Font family descriptor
• FORTRAN FORmula TRANslator
• FPU Floating Point Unit
• FRAD Frame Relay Access Device
• FROM Factory ROM
• FRU Field Replaceable Unit
• FS Field Separator
• FS File Separator
• FSB Front Side Bus
• FSF Free Software Foundation
• FSK Frequency Shift Keying
• FT Fault Tolerant
• FTAM File Transfer and Access Method
• FTP File Transfer Protocol
• FTP Foil Twisted Pair
• FTTC Fibre To The Curb
• FTTH Fibre To The Home
• FTTP Fibre To The Building
• FUP Funktionsplan

G



• GAL Global Address List
• GATF Graphic Arts Technical Foundation
• GB GigaByte (1,073,741,824 bytes)
• GCR Group Coded Recording
• GDG Generation Data Group
• GDS Global Directory Service
• GDT Global Descriptor Table
• GDTR Global Descriptor Table Register
• GE Graphic Escape
• GETVIS GET VIrtual Storage
• GID Group ID
• GIF Graphics Interchange Format
• GIS Generalized Information System
• GIX Global Internet Exchange
• GKS Graphical Kernel System
• GML Generalized Markup Language
• GOSIP Government OSI Profile
• GP General Protection
• GPIB General-Purpose Interface Bus
• GRS Global Resource Serialization
• GS Group Separator
• GTF Generalized Trace Facility
• GUI Graphical User Interface
• GUIP Graphical User Interface for Blind people
• GUUG German Unix User Group

H



• H&J Hyphenation and Justification
• HA Home Address
• HA Host Agent
• HADA High Availability Disk Array
• HCL Hue, Chroma, and Luminance
• HDA Head-Disk Assembl
• HDBV Host Data Base View
• HDLC High Level Data Link Communications
• HDSL High-bit rate Digital Subscriber Loop
• HDTV High Definition TV
• HE High End (system)
• HGC Hercules Graphics Card
• HIC Host Interface Computer
• HLL High Level Language
• HLS Hue-Lightness-Saturation
• HMD Head-Mounted Display
• HMMP HyperMedia Management Protocol
• HMMS HyperMedia Management Schema
• HPCL Hewlett-Packard Control Language
• HPFS High Performance File System
• HPGL Hewlett-Packard Graphical Language
• HPR High Performance Routing
• HR Horizontal Rule
• HSB Hue-saturation-brightness
• HSELAN High Speed ELAN
• HSI Hue-Saturation-Intensity
• HSLAN High Speed LAN
• HSSI High Speed Serial Interface
• HSV Hue-Saturation-Value
• HT Horizontal Tab
• HTML Hypertext Markup Language
• HTTP Hypertext Transfer Protocol
• Hz Hertz

I



• I-Net Intranet
• I/O Input/Output
• I/O Input/Output
• IA5 International Alphabet Five
• IAB Internet Activities Board
• IC Integrated Circuit
• ICEM Integrated Computer Engineering and Manufacturing
• ICMP Internet Control Message Protocol
• ID Identifier
• IDA Indirect Data Addressing
• IDA Intelligent Drive Array
• IDE Integrated Drive Electronics
• IDEA International Data Encryption Algorithm
• IDL Interfacce Definition Language
• IDT Interrupt Descriptor Table
• IEC InterExchange Carrier
• IEEE Institute of Electrical and Electronic Engineers
• IETF Internet Engineering Task Force
• IF Interrupt Flag
• IFF Interchange File Format
• IFIP International Federation of Information Processing
• IFS Interchange File Separator
• IFS InterFrame Space
• IGES Initial Graphics Exchange Specification
• IGMP Internet Group Membership Protocol
• IGS Interchange Group Separator
• II Interactive Interface
• IISP Interim Interswitch Signaling Protocol
• IKT Informatione- und Kommunikationstechnik
• ILC InterLanguage Communication
• IML Initial Microcode Load
• IMPL Initial Microprogram Load
• IMR Interrupt Mask Registers
• IMS Information Management System
• IMS/VS Information Management System / Virtual Storage
• INP Inhibit Presentation
• INT INTerrupt
• IOC ISDN Ordering Code
• IOCP Input/Output Configuration Program
• IOCS Input/Output Control System
• IOGEN Input/Output device GENeration
• IOPL Input/Output Privilege Level
• IOS Input/Output Supervisor
• IP Internet Protocol
• IPL Initial Program Load
• IPM InterPersonal Message
• IPSE Integrated Project Support Environment
• IPX Internet Packet Exchange
• IR Index Return
• IRC Internet Relay Chat
• IRDS Information Resource Dictionary System
• IRQ Interrupt ReQuest
• IRS Interchange Recors Separator
• IS Information System
• IS Intermediate System
• IS International Standard
• ISA Industry Standard Architecture
• ISAM Indexed Sequential Access Method
• ISDN Integrated Services Digital Network
• ISFMS Indexed Sequential File Management System
• ISMF Interactive Storage Management Facility
• ISO International Standardization Organisation
• ISO IEC ISO International Electrotechnical Commitee
• ISODE ISO Development Environment
• ISP Internet Service Provider
• ISPF Interactive System Produvtivity Facility
• ISPF/PDF ISPF Program Development Facility
• ISR Information Storage and Retrieval
• ISR Intermediate Session Routing
• ISSE Intel SIMD Sreaming Extension
• ISV Independent Software Vendor
• IT Indent Tab
• ITB Intermediate Transmission Block
• ITLD International Top-Level Domain
• ITRC Information Technology Requirements Council
• ITU International Comunication Union (ehem. CCITT)
• ITV Interactive TeleVision
• IUS Interchange Unit Separator
• IWS Intelligent WorkStation

J



• JCC Job Control Command
• JCL Job Control Language
• JCS Job Control Statement
• JCT JES Control Table
• JCT Journal Control Table
• JECL Job Entry Control Language
• JEIDA Japan Electronics Industry Development Association
• JES Job Entry Subsystem
• JPEG Joint Photographic Experts Group

K



• K Kilobyte
• KB KiloByte (1,024 Bytes)
• KBPS KiloBits Per Second
• kHz KiloHertz
• KIP Kinetics Internet Protocol
• KIPS Kilo Instructions per second
• KL Key Length
• KOPS Kilo Operations per second
• KSDS Key Sequenced Data Set
• KVA KiloVolt Ampere

L



• L2F Layer 2 Forwarding
• L2TP Layer 2 Tunneling Protocol
• LAN Local Area Network
• LAPS LAN Adapter Protocol Support Program
• LBL Label
• LCD Liquid Crystal Display
• LCS Lotus Communication Server
• LDAP Lightweight Directory Access Protocol
• LDMF Librarian Disc Master File
• LDS Linear Data Set
• LDT Local Descriptor Table
• LE Low End (system)
• LEC LAN Emulation Client
• LEC Local Exchange Carrier
• LED Light Emitting Diode
• LF Linefeed
• LIC Line Interface Computer
• LIFO Last In, First Out
• LILO Last In, Last Out
• LILO Linux Loader
• LIM-EMS Lotus Intel Microsoft EMS
• LIOCS Logical Input/Output Control System
• LISP List Programming
• LLC2 Logical Link Control Layer 2
• LOC Lines Of Code
• LOS Local Operator System
• LPI Lines Per Inch
• LRC Longitudinal Redundancy Checking
• LRU Least Recently Used
• LSD Least Significant Digit
• LSI Large Scale Integration -> VLSI
• LU Logical Unit
• LUB Logical Unit Block
• LUT Look Up Table
• LVT Light Valve Technology
• LW Line Work
• LZ Lempel-Ziv
• LZW Lempel-Ziv-Welch

M



• MAC Media Access Control
• MAN Metropolitan Area Network
• MAP Maintenance Analysis Procedure
• MAP Manufacturing Automation Protocol
• MAPI Messaging Applications Programming Interface
• MB MegaByte (1,048,576 bytes)
• MBCS Multiple Byte Character Set
• MBONE Multicast Backbone
• MBPS MegaBits Per Second
• MCA Micro Channel Architecture
• MCBF Mean Cycles Between Failures
• MCCOI Multimedia Communications Community of Interest
• MCGA MultiColour Graphics Array
• MCI Media Control Interface
• MD Management Domain
• MD5 Message Digest 5
• MDA Monochrome Display Adapter
• MEB Memory Expansion Board
• MFA Modify Field Attribute
• MFC Microsoft Foundation Classes
• MFKS Multifunktionales Konferenzsystem
• MFLOPS Million Floating-Point Operations Per Second
• MFM Modified Frequency Modulation
• MFV Multi File Volume
• MFWS MultiFunction WorkStation
• MGA Monochrome Graphic Adapter
• MH Mobile Host
• MHS Message Handling System
• MI Multiple Inheritance
• MIB Management Information Database
• MICR Magnetic Ink Character Reader
• MIDI Musical Instrument Digital Interface
• MIME Multipurpose Internet Mail Extensions
• MIPS Millions of Instructions Per Second
• MISC Minimum Instruction Set Computer -> CISC, RISC
• MLPPP MultiLink PPP
• MMDF Multi-Channel Memorandum Distribution Facility
• MMDS Multi-Megabit Data Services
• MMFS Manufacturing Manage Format Standard
• MMX Multi Media eXtensions
• MNP Microcom Network Protocol
• MODEM MOdulator/DEModulator
• MOPS Mega Operations per second
• MOTIS Message-Oriented Text Interchange Systems
• MP Multiprocessing
• MPC Multimedia PC
• MPEG Motion Picture Experts Group
• MPOA MultiProtocol Over Asynchronous transfer mode
• MPSD MultiPath Storage Director
• MPX multiplex
• MS Message Store
• MS-DOS Microsoft Disk Operating System
• MSA Metropolitan Statistical Area
• MSD Most Significant Digit
• MSG Message
• MSM MultiSession Monitor
• MSW Machine Status Word
• MTA Message Transfer Agent
• MTBF MeanTime Between Failures
• MTDA Mean Time Data Availability
• MTS Message Transfer System
• MUD Multi-User Dungeon
• MULTICS MULTiplexed Information and Computing Service
• MUMPS Massachusetts General Hospital Utility Multi-Programmings System
• MUMPS Multi-User Multi-ProgrammingSystem
• MVS Multiple Virtual System
• MVS/ESA Multiple Virtual System / Extended System Architecture
• MVS/XA Multiple Virtual System / Extended Architecture
• MVSCP MVS Configuration Program

N



• NAC Network Adapter Card
• NAK Negative Acknowledgement
• NAP Network Access Point
• NAS Network Access Server
• NAT Network Address Translation
• NAU Network Addressable Unit
• NBS National Bureau of Standards
• NBS Numeric BackSpace
• NC Numeric Control
• NCCF Network Communication Control Facility
• NCP Network Control Processor
• NCP Network Control Program
• NCP/VS Network Control Program/Virtual Storage
• NDIS Network Driver Interface Specification
• NetSP Network Security Program
• NFNT New font numbering table
• NFS Network File System
• NHRP Next Hop Routing Protocol
• NIC Network Interface Card
• NIC Network Information Center
• NIS Network Information Service
• NIST National Institute for Standards and Technology
• NJE Network Job Entry
• NL New Line
• NLQ Near Letter Quality
• NLT Nucleus Load Table
• NMI NonMaskable Interrupt
• NNTP Network News Transport Protocol
• NSA National Security Agency
• NSC1 Network Systems Cypher One
• NSP Numeric Space
• NSS NATURAL Security-System
• NT Network Termination
• NTS/2 Network Transport Services/2
• NTSC National Television System Committee
• NUI Network User Identification
• NUL Null
• NUMA Non-Uniform Memory Access
• NVOD Near Video On Demand
• NVRAM NonVolatile Random Access Memory
• NVS NonVolatile Storage

O



• O/R Originator / Recipient
• OC3 155 Mbit/s
• OCR Optical Character Recognition
• OCX OLE Control Extension
• ODA Open Document Architecture
• ODSI Open Directory Service Interfaces
• OEM Original Equipment Manufacturer
• OI Object Interface
• OLE Object Linking and Embedding
• OLTEP On-Line Test Executive Program
• OLTP On-Line Transaction Processing
• OMG Object Management Group
• OMR Optical Mark Recognition
• OO Objektorientierung
• OOA Objektorientierte Analyse
• OODBMS Object Oriented DBMS
• OOP Objektorientierte Programmierung
• OOPL Object Oriented Programming Language
• OOPS Object Oriented Programming System
• OP Operator Panel
• OPI Open Prepress Interface
• ORB Object Request Broker
• OS Operating System
• OS/2 Operating System/2
• OSA Office Systems Architecture
• OSA Open System Architecture
• OSF Open Software Foundation
• OSI Open Systems Interconnection
• OSI/RM OSI Reference Model
• OSNS Open Systems Network Support
• OSPF Open Shortest Path First
• OSTC Open System Testing Consortium
• OTPROM One Time Programable ROM
• OWL Object Windows Library

P



• PABX Private Automatic Branch Exchange
• PAD Packet Assembly Disassembly
• PAL Phase Alternating Line
• PAL Programmable Array Logic
• PAM Partitioned Access Method
• PAP Password Authentication Protocol
• PB PetaByte (1,125,899,906,842,624 bytes)
• PBX Private Branch Exchange
• PC Personal Computer
• PC Personal Computing
• PC Program Control
• PCB Printed Circuit Board
• PCB Program Control Block
• PCI Peripheral Component Interface
• PCI Program Controlled Interuption
• PCIL Private Core Image Library
• PCL Printer Control Language
• PCM Plug Compatible Manufacturers
• PCMCIA Personal Computer Memory Card International Association
• PCN Personal Communication Network
• PCP Program Control Program
• PCS Personal Communication Services
• PCT Private Communication Technology
• PCT Program Control Table
• PD Public Domain
• PDA Personal Digital Assistant
• PDAD Proposed Draft Addendum
• PDAU Physical Data Access Unit
• PDF Program Development Facility
• PDL Page Description Language
• PDO Portable Distributed Objects
• PDS Partitioned Data Set
• PDS Premise Distribution System
• PDS Processor Direct Slot
• PDU Protocol Data Unit
• PDX Printer Description Extension
• PE Printer's error
• PE Protection Enabled
• PEARL Processor and Experiment Automation Realtime Language
• PEM Privacy Enhanced Mail
• PEP Partitioned Emulation Program
• PER Program Event Recording
• PERL Practical Extraction and Report language
• PF Parity Flag
• PFK Program Function Key(board)
• PFM Printer Font Metric
• PGA Professional graphics adapter
• PGP Pretty Good Privacy
• PIB Program Information Block
• PID Process ID
• PIFS Point InterFrame Space
• PIM Personal Information Management
• PIN Personal Identification Number
• PIOCS Physical Input/Output Control System
• PL Procedure Library
• PL/1 Programming Language 1
• PLI Programming Language 1
• PLPA Pageable Link Pack Area
• PLT Program List Table
• PLU Primary Logical Unit
• PMMU Paged memory management unit
• PMS Pantone Matching System
• PMS Project Management System
• PMT Photomechanical Transfer (photostat)
• PMT Photomultiplier Tube
• PNNI Private Network-to-Network Interface
• POC Program-Operator Communication
• POP Point Of Presence
• POP Post Office Protocol
• POSIX Portable Operating System Interface for UNIX
• POTS Plain Old Telephone System
• POWER Priority Output Writer, Execution processors and input Readers
• PP Presentation Position
• PPD PostScript Printer Description
• PPGA Plastic Pin Grid Array
• PPM Pages Per Minute
• PPP Point-to-Point Protocol
• PPT Processing Program Table
• PPTP Point-to-Point Tunneling Protocol
• PPV Pay Per View
• PRDMD Private Directory Management Domain
• PRL Private Relocatable Library
• PRMD Private Management Domain
• PROM Programable Read Only Memory
• PSB Program Specification Block
• PSDN Packet Swiched Data Network
• PSRAM Pseudo SRAM
• PSSL Private Source Statement Library
• PSTN Public Swiched Telephone Network
• PSW Program Status Word
• PTF Program Temporary Fix
• PTR PoinTeR
• PU Physical Unit
• PUB Physical Unit Block
• PVC Permanent Virtual Circuit
• PVP Packet Video Processor
• PWB Printed Wire Board
• PWS Programmable WorkStation

Q



• QAM Quadrature Amplitude Modulation
• QBE Query By Example
• QCIF Quater Common Intermediate Format
• QIC Quarter-Inch Cartridge
• QSAM Queued Sequential Access Method
• QTAM Queued Teleprocessing Access Method

R



• R0 Record zero
• RACF Resource Access Control Facility
• RAID Redundant Array of Inexpensive Disks
• RAID Redundant Array of Independent Disks
• RAM Random Access Memory
• RARP Reverse Address Resolution Protocol
• RBA Relative Byte Adresse
• RC Robot Control
• RCP Remote Communication Processor
• RCS Revision Control System
• RDA Remote Data Access
• RDBMS Relational DataBase Management System
• RDN Relative Distinguished Name
• RES Restore
• RF Resume Flag
• RFC Request For Comments
• RFF Required Form Feed
• RFS Remote File System
• RGB Red, Green, Blue
• RGM Red, Green, Blue (Monitor)
• RIFF Resource Interchange File Format
• RIP Raster Image Processor
• RIP Router Information Protocol
• RISC Reduced Instruction Set Computer
• RJE Remote Job Entry
• RL Relocatable Library
• RLD Relocation Dictionary
• RLE Run Length Encoded file
• RLL Run Length Limited
• RMF Resource Management Facility
• RNL Required New Line
• ROM Read Only Memory
• RPC Remote Procedure Call
• RPG Report Program Generator
• RPL Requestor's Privilege Level
• RPL Research Programming Language
• RPM Revolutions Per Minute
• RPS Rotational Position Sensing
• RPT Repeat
• RRDS Relative Record Data Set
• RRED Right Reading Emulsion Down
• RREU Right Reading Emulsion Up
• RS Record Separator
• RSP Required Space
• RSVP Resource Reservation Protocol
• RTC Real Time Clock
• RTCP Realtime Transport Control Protocol
• RTF Rich Text Format
• RTM/SF Realtime Monitor / Systems Facility
• RTP Realtime Transport Protocol
• RTSE Reliable Transfer Service Element
• RWSI Remote Workstation Interface

S



• S.W.I.F.T. Society for Worldwide Interbank Financial Telecommunication
• S/STP Shielded STP
• SA Set Attribute
• SAA Storage Accounting Area
• SAA System Application Architecture
• SAM Sequential Access Method
• SAP Service Access Point
• SAP Service Advertising Protocol
• SAR Segmentation And Reassembly
• SBCS Single Byte Character Set
• SBS Subscript
• SC Storage Control
• SCA Shared Control Array
• SCCS Source Code Control System
• SCDS Source Control Data Set
• SCI Scalable Coherent Interconnect
• SCODL Scanned Conversion Object Description Language
• SCP Storage Control Program
• SCP System Control Program
• SCRAM Static Column Random Access Memory
• SCSI Small Computer Systems Interface
• SDH Synchronous Digital Hierarchy
• SDK Software Development Kit
• SDL System Directory List
• SDLC Synchronous Data Link Control
• SDRAM Synchronous DRAM
• SDSF System Display and Search Facility
• SE Software Entwicklung
• SE System Engineer
• SECC Single Edge Contact Connector
• SECAM Sequential Couleur a'Memorie
• SEL Select
• SEPP Single Edge Processor Package
• SET Software-Engineering-Technology
• SF Sign Flag
• SF Support Facility
• SFA Salesforce Automation
• SFBI Shared Frame Buffer Interconnect
• SFE Start Field Extended
• SFT System Fault Tolerance
• SFTP Shielded Foil Twisted Pair
• SGML Standard Generalized Markup Language
• SHTTP Secure HTTP
• SHY Syllable Hyphen
• SI Shift In
• SI Single Inheritance
• SI Standard Interface
• SIFS Short InterFrame Space
• SIFT Stanford Information Filtering Tool
• SIG Special Interest Group
• SIM Service Information Message
• SIMD Single Instruction Multiple Data
• SIMM Single In-line Memory Module
• SIRDS Single Image Random Dot Stereogram
• SIT System Initialization Table
• SL Source Statement Library
• SLD Structured Logic Design
• SLED Single Large Expensive Disk
• SLIP Serial Line Internet Protocol
• SLR Service Level Reporter
• SLU Secondary Logical Unit
• SM Set Mode
• SMDS Switched Multimegabit Data Service
• SMF System Management Facility
• SML MVS Storage Management Library
• SMLI Stateful MultiLayer Inspection
• SMP Symetric MultiProcessing
• SMP System Modification Program
• SMS Storage Management Subsystem
• SMTP Simple Mail Transfer Protocol
• SNA System Network Architecture
• SNADS SNA Distribution Services
• SNMP Simple Network Management Protocol
• SNOBOL String Oriented Symbolic Language
• SNT Sign-On Table
• SO Shift Out
• SOD Service On Demand
• SOH Start Of Heading
• SOM System Object Model
• SOS Start Of Significance
• SP Space
• SPA Software Publishers Association
• SPARC Scalar Processor ARChitecture
• SPDU Session Protocol Data Unit
• SPM System Performance Monitor/2
• SPOOL Simultaneous Peripheral Operations On Line
• SPP Scalable Parallel Processing
• SPS Superscript
• SPX Sequenced Packet eXchange
• SQL Structured Query Language
• SQL/DS Structured Query Language / Data System
• SRAM Static Random Access Memory
• SRT System Recovery Table
• SRU Shared Resource Unit
• SS Single Sided
• SS Stack Segment
• SSCP System Service Control Point
• SSID SubSystem IDentifier
• SSL Secure Socket Layer
• STM Synchronous Transfer Mode
• STP Shielded Twisted Pair
• STT Secure Transaction Technology
• STX Start of Text
• SUB Substitute
• SV Storage Violation
• SVA Shared Virtual Area
• SVC Supervisor Call
• SVC Switched Virtual Circuit
• SVGA Super-VGA
• SW Switch
• SWOP Specifications for Web Offset Printing
• SYN Synchronous Idle
• SYSOP System Operator

T



• T1 1.544 Mbit/s
• T3 45 Mbit/s
• TARGA Truevision Advanced Raster Graphics Adapter
• TB TeraByte (1,099,511,627,776 bytes)
• TC Terminal Control
• TCA Task Control Area
• TCAM Telecommunications Access Method
• TCB Task Control Block
• TCL Tool Command Language
• TCM Thermal Conduction Module
• TCO Triple Capacity Option
• TCP Terminal Control Program
• TCP/IP Transmission Control Protocol/Internet Protocol
• TCT Terminal Control Table
• TCTTE Terminal Control Table Terminal Entry
• TCU Transmission Control Unit
• TD Transient Data
• TDIA Transient Data Input Area
• TDM Time-Division Multiplexing
• TDOA Transient Data Output Area
• TDP Transient Data Program
• TEO Technical Electronic Office
• TF Trap Flag
• TIC Technical Integrity Check
• TIFF Tagged Image File Format
• TIOA Terminal Input/Output Area
• TLB Translation Lookaside Buffer
• TLBL Tape Label
• TMO Thermo-Magneto-Optic technology
• TNEF Transport-Neutral Encapsulation Format
• TOC Table Of Contents
• TOP Technical Office Protocol
• TPDU Transport Protocol Data Unit
• TPF Transaction Processing Facility
• TPI Tracks Per Inch
• TPM Third-Party Maintenance
• TPS Transactions Per Second
• TRN Transparent
• TS Telecommunication System
• TS Temporary Storage
• TSIOA Temporary Storage Input/Output Area
• TSO Time Sharing Option
• TSP Temporary Storage Program
• TSR Terminate and Stay Resident
• TTA Teletex Attachment (Teletexzusatz)
• TTL Transistor Transistor Logic
• TTR Track Record
• TTY TeleTYpe
• TWA Transaction Work Area
• TWA Two-Way Alternate
• TWS Two-Way Simultaneous
• TX Telex
• TXT Text

U



• UA User Agent
• UAE Unrecoverable Application error
• UART Universal Asynchronous Receiver/Transmitter
• UBR Undefined Bit Rate
• UBS Unit Backspace
• UCB Unit Control Block
• UCR Undercolor removal
• UCS Universal Character Set
• UCSB Universal Character Set Buffer
• UCW Unit Control Word
• UDP User Datagram Protocol
• UI User Interface
• UID User ID
• UMB Upper Memory Block
• UNC Universal Naming Convention
• UNC Universal Network Convention
• UPC Universal Product Code
• UPS Uninterruptible Power Supply
• UPSI User Program Switch Indicator
• UR Unit Record
• URL Uniform Resource Locator
• US Unit Separator
• USART Universal Synchronous/Asynchronous Receiver/Transmitter
• USENET USEr NETwork
• USM UnSharp Masking
• USRT Universal Synchronous Receiver/Transmitter
• USV Unterbrechungsfreie StromVersorgung
• UTP Unshielded Twisted Pair
• UUCP Unix-to-Unix Copy Program

V



• VAD Value Added Dealer
• VAN Value Added Network
• VAP Value Added Process
• VAR Value Added Reseller
• VAST Virtual Archive Storage Technology
• VB Visual Basic
• VBA Visual Basic for Applications
• VBR Variable Bit Rate
• VBN Vermitteltes Breitbandnetz
• VC Virtual Circuit
• VC-SDRAM Virtual Channel SDRAM
• VCC Virtual Circuit Connection
• VCI Virtual Circuit Identifier
• VCNA Vtam Communication Network Application
• VCPI Virtual Control Program Interface
• VDAC Video Digital Analog Converter
• VDI Video Display Interface
• VDT Video Display Terminal
• VDU Visual Display Unit
• VERONICA Very Easy Rodent-Oriented Netwide Index to Computerized Archives
• VGA Video Graphics Array
• VGC Video Graphics Controller
• VGM Video Graphics Monitor
• VHDSL Very High-bit rate Digital Subscriber Loop
• VHLL Very High-Level Language
• VHS Video Home System
• VIO Video Input/Output
• VIO Virtual Input/Output
• VIPA Virtual IP Addressing
• VLAN Virtual LAN
• VLSI Very Large Scale Integration
• VM Virtual Machine
• VM/SP Virtual Machine / System Product
• VMMAP VM Monitor Analysis Program
• VMOS Vertical MOS
• VMPPF VM Performance Planning Facility
• VMPRF VM Performance Reporting Facility
• VMS Virtual Management System
• VOD Video On Demand
• VPD Vital Product Data
• VPDN Virtual Private Data Network
• VPI Virtual Path Identifier
• VPN Virtual Private Network
• VR Virtual Reality
• VRAM Video RAM
• VRML Virtual Reality Modeling Language
• VRC Vertical Redundancy Checking
• VS Virtual Storage
• VSAM Virtual Storage Access Method
• VSAT Very Small Aperture Terminal
• VSM Virtual Storage Management
• VSN Volume Serial Number
• VT Vertical Tab
• VTAM Virtual Telecommunications Access Method
• VTOC Volume Table of Contents
• VTP Virtual Terminal Protocol
• VTP Virtual Terminal Program
• VTX VideoTeXt
• VVDS VSAM Volume Data Set

W



• W3 World Wide Web
• W4WG Windows for Workgroups
• WABI Windows Application Binary Interface
• WAIS Wide Area Information Service
• WAN Wide Area Network
• WATM Wireless ATM
• WATS Wide Area Telecommunications Service
• WHAT Wireless Hybrid Asynchronous Time-bounded
• WIMP Windows, Icons, Mice and Pointers
• WINS Windows Internet Name Service
• WMAC Wireless Media Access Control
• WMF Windows metafile
• WORM Write Once, Read Many times
• WOSA Windows Open Services/Systems Architecture
• WRED Wrong Reading Emulsion Down
• WREU Wrong Reading Emulsion Up
• WS WorkStation
• WTO Write To Operator
• WUS Word Underscore
• WWW World Wide Web
• WXTRN Weak External Reference
• WYSIWYG What You See Is What You Get

X



• XA EXtended Architecture
• XIP Execute In Place
• XLT Transaction List Table
• XMS Extended Memory Specification
• XT eXtended Technology

Y



• Y2K Year 2000
• YIQ (color components in NTSC color space)
• YUV (color components in SECAM and PAL color spaces)

Z



• ZBR Zero Bug Release
• ZD Zero Defects
• ZF Zero Flag