AA Auto Answer Advanced Communications Function
AAB All-to-All Broadcast ACH Automated Clearing House
AAL Asynchronous Transfer Mode Adaption Layer ACIAS Automated Calibration Interval Analysis System
AAP Applications Access Point [DEC] ACIS American Committee for Interoperable Systems
AAS All-to-All Scatter ACK Acknowledgment
AASP ASCII Asynchronous Support Package ACL Access Control List
AAT Average Access Time ACM Association for Computing Machinery
ABC * Atanasoff-Berry Computer (First digital Audio Compression Manager [Microsoft]
calculating machine that used vacuum tubes) ACMS Application Control Management System
ABEND Abnormal End ACP Ancillary Control Program + Auxilary Control Process
ABI Application Binary Interface ACPI Advanced Configuration Power Interface
ABIOS Advanced BIOS ACROSS Automated Cargo Release and Operations
ABIST Automatic Built-In Self-Test [IBM] Service System
ABLE Adaptive Battery Life Extender ACS Access + Access Control Set +
ABR Available Bit Rate Access Control System +
ABRS Automated Book Request System [British Library] * Advanced Computer System [IBM] +
ABS Address Book Synchronization [IBM] + Absolute Asynchronous Communication Server
ABT Abort ACTS Automated Computer Time Service
ABTS ASCII Block Terminal Services ACTT Advanced Communication and Timekeeping
AC Autocheck + Automatic Computer + Alternating Current Technology [Seiko]
ACAP Application Configuration Access Protocol ACU Automatic Calling Unit
ACC Accumulator A/D Analog to Digital
ACD Automatic Call Distribution ADA Automatic Data Acquisitions + Programming
ACDI Asynchronous Communications Device Interface Language named after Augusta Ada Lovelace)
ACE Access Control Entry + ADB Apple Desktop Bus
Advanced Computing Environment [SCO] + ADC Adaptive Data Compression (protocol) [Hayes] +
Adverse Channel Enhancements [Microcom] + Add with Carry + Analog to Digital Converter
* Automatic Computing Engine ADCCP Advanced Data Communication Control Procedures
ACF Access Control Field + ADD Automatic Document Detection [WordPerfect] ADF Automatic Document Feeder + AFA Accelerated File Access
Automatically Defined Function AFC Automatic Font Change + Automatic Frequency Control
.ADF Adapter Description File (file name extension) AFD Automatic File Distribution
ADI AutoCad/AutoDesk Device Interface (driver) AFDW Active Framework for Data Warehousing [Microsoft]
ADL Address Data Latch AFII Association for Font Information Interchange
ADLAT Adaptive Lattice Filter AFIRM Automated Fingerprint Image Reporting and Match
ADLC Adaptive Lossless Data Compression [IBM] + AFIS Automated Fingerprint Identification System
Asynchronous Data Link Control .AFM Adobe Font Metrics (file name extension) [Adobe Systems]
ADMACS Apple Document Mangagement And Conrol System AFP Advanced Function Presentation [IBM] +
ADMD Administrative Management Domain [X.400] Appletalk Filing Protocol [Macintosh]
.ADN Add In Utility (file name extension) AFS Andrew File System (protocols)
[Lotus 1-2-3] [LDC] AFTP Anonymous File Transfer Protocol
ADO Active Data Objects AGC Automatic Gain Control
ADP Automatic Data Processing AGP Accelerated/Advanced Graphics Port
ADPCM Adaptive Differential Pulse Code Modulation AGRAS Antiglare-Antireflective-Antistatic
ADR Address AGU Address-Generation Unit
ADS Application Development Solutions [AT&T] + AHS Automated Highway Systems
Application Development System + AI Analog Input + Artificial Intelligence
Automatic Distribution System AIA Applications Integration Architecture [DEC]
ADSC Address Status Changed + AIC AIXwindows Interface Composer [IBM]
Adobe Document Structuring Conventions AIF Audio Interchange Format
ADSL Asymmetric Digital Subscriber Line AIIM Association for Information and Image Management
ADSP Apple Datastream Protocol AIN Advanced Intelligent Network [Bell Atlantic]
ADSR Attack, Decay, Sustain, Release AIS Automated Identification System [NCIC]
ADT Abstract Data Type + Application Data Types AISB Association of Imaging Service Bureaus
ADU Automatic Dialing Unit AISP Association of Information Systems Professionals
AE Above or Equal AIT Advanced Intelligent Tape [Sony]
AEB Analog Expansion Bus [Dialogic] AIX Advanced Interactive Executive [IBM]
AF Auxiliary carry Flag ALC Arithmetic and Logic Circuits + Automatic Level Control ANX Automotive Network Exchange [Chrysler/Ford/General Motors]
ALE Address Latch Enable + AO Analog Output
Application Linking and Embedding AOCE Apple Open Collaboration Environment
ALGOL Algorithmic Oriented Language (see IAL) AOE Application Operating Environment [AT&T]
ALIBI Adaptive Location of Internetworked Bases AOL America Online
of Information AOS Add Or Subtract
ALINK Active Link [HTML] AP Adjunct Processor + Application Processor
ALIWEB Archie Like Indexing in the Web [Internet] A/P Accounts Payable
ALN Asynchronous Learning Network APA Adaptive Packet Assembly +
ALR Advanced Logic Research, Inc. All Points Addressable +
ALT Alternate (mode) Arithmetic Processing Accelerator
ALT. Alternate lifestyle [USENET Newsgroup Category] APAR Authorized Program Analysis Report [IBM]
ALU Arithmetic Logic Unit APAREN Address Parity Enable [IBM]
AMA Automatic Message Accounting APCUG Association of PC User Groups
AMANDDA Automated Messaging and Directory Assistance API Application Program Interface
AMD Active Matrix Display + APIC Advanced Programmable Interrupt Controller (bus) [Intel]
Advanced Micro Devices, Inc. APIS Advanced Passenger Information System
AMI American Megatrends, Inc. APL * A Programming Language (Mathematics)
AMMA Advanced Memory Management Architecture APM Advanced Power Management [IBM]
[Everex Systems] APOP Authenticated Post Office Protocol
AMPS Advanced Mobile Phone Service .APP Application (file name extension) [R:Base]
ANCOVA Analysis of Covariance APPC Advanced Program-to-Program Communications [IBM]
ANDF Architecture-Neutral Distribution Format APPI Advanced Peer-to-Peer Internetworking
ANI Automatic Number Identification APPN Advanced Peer-to-Peer Networking [IBM]
.ANI Animated Cursor (file name extension) [Microsoft] APPS Applications
ANN Artificial Neural Network APRP Adaptive Pattern Recognition Processing
.ANN Annotations (file name extension) [IBM] APS Advanced Photo System + Advanced Printing Service [IBM]
ANOVA Analysis Of Variance Asynchronous Protocol Specification
ANSI American National Standards Institute APSE ADA Programming Support Environment APT Address Pass Through + ASAP As Soon As Possible +
Advanced Parallel Technology + Automatic Switching And Processing
Automatically Programmed Tools AS3AP ANSI SQL Standard Scalable and Portable
A/R Accounts Receivable .ASC ASCII text (file name extension)
ARA AppleTalk Remote Access ASCC * Automatic Sequence Controlled Calculator [IBM]
ARAG Antireflective-Antiglare ASCII American Standard Code for Information Interchange
ARAS Antireflective-Antistatic ASF Active Streaming Format [Microsoft]
.ARC Archive (file name extension) ASIC Application-Specific Integrated Circuit
ARCA Advanced RISC Computing Architecture ASIT Advanced Security and Identification Technology
ARCnet Attached Resource Computer Network ASL Adaptive Speed Levelling
.ARJ Compressed File (file name extension) [Jung] ASLM Apple Shared Library Manager [Macintosh]
ARL Adjusted Ring Length .ASM Assembler Source Language (file name extension)
ARLL Advanced Run Length Limited ASMP Asymmetric Multprocessing
ARM Advanced RISC Machine (processor) + ASN Abstract Syntax Notation + Autonomous System Number
Annotated Reference Manual + ASO Automated Systems Operations
Asynchronous Response Mode ASP Active Server Page [Microsoft] +
ARMA Association of Records Managers and Administrators Authorized Service Provider +
ARP Address Resolution Protocol [Novell] Association of Shareware Professionals
ARPANET Advanced Research Projects Agency Network .ASP Active Server Page (file name extension)
ARPL Adjust Requested Privilege Level ASPI Advanced SCSI Programming Interface [Adaptec]
ARTA Apple Real Time Architecture ASPS Advanced Signal Processing System
ARTIC A Real-Time Interface Coprocessor [IBM] ASR Address Space Register + Automatic Send-Receive +
ARTS Asynchronous Remote Takeover Server Automatic Speech Recognition
.ARTS Cultual Groups (Domain Name) [Internet] AST AST Research, Inc. (named from first initials of
ARTT Asynchronous Remote Takeover Terminal the founders: Albert Wong, Safi Qureshey, Thomas Yuen)
ARQ Automatic Repeat Request AS/U Advanced Server for Unix
ARU Audio Response Unit ASYNC Asynchronous
AS Autonomous System [Internet] AS/400 Application System/400 [IBM]
ASAI Adjunct Switch Application Interface [AT&T] AT Advanced Technology + Attention ATA Advanced Technology Attachment AVG Average
ATDP Attention Dial Pulse AVI Audio Visual Interleave [Microsoft]
ATDT Attention Dial Tone AVR Automatic Voice Recognition
ATE Automated Test Equipment AVT Applied Voice Technology
ATG Advanced Technology Group AWG American Wire Gage
ATH Attention Hang-Up (Modem command) AWK (Unix language named after its authors...
ATL Active Template Library Al Aho, Peter Weinberger and Brian Kernighan)
ATM Adobe Typeface Manager + Asynchronous Transfer Mode + AWS Advanced Workstations and Systems (group) [IBM]
Automated Teller Machine AWT Abstract Window Toolkit [Java]
ATPS AppleTalk Printing Services [Macintosh] AX Architecture Extended + Automatic Transmission
ATR Automatic Terminal Recognition
B... ATS Administrative Terminal System +
Apple Terminal Services BACP Bandwidth Allocation Control Protocol
AT&T American Telephone and Telegraph BAK Binary Adaptation Kit [Microsoft]
ATTN Attention .BAK Backup (file name extension)
ATTRIB Attribute (also ATR) BAL Basic Assembly Language
ATZ Attention Restore configuration profile from BALUN Balanced Unbalanced (device)
nonvolatile RAM (Modem command) BAM Boyan Action Module
.AU Audio (file name extension) BARTS Bell Atlantic Regional Timesharing
AUDIT Automated Data Input Terminal .BAS Basic Language (file name extension)
AUI Attachment/Autonomous Unit Interface BASH Bourne Again Shell [Unix]
AUP Acceptable Use Policy [Internet] BASIC Beginner's All-purpose Symbolic Instruction Code
AUTO Automatic BASM Built-In Assembler
AUTOEXEC Automatic Execution BAT Block Address Translation
AUX Auxiliary + (First Serial Port) .BAT Batch Processing (file name extension)
AV Audio/Video + Audiovisual + Authenticity Verification BBS Bulletin Board System
AVA Audio Visual Authoring [IBM] BCC Block Check Character
AVC Audio Visual Connection [IBM] BCC: Blind Carbon Copy
AVD Alternating Voice and Data BCD Binary Coded Decimal B-CHANNEL Bearer Channel .BGI Borland Graphic Interface (file name extension)
BCL Batch Command Language BGP Border Gateway Protocol
BCN Beacon BGT Branch if Greater Than
BCP Best Current Practice + Bulk Copy Program BHI Branch if Higher
BCPL Basic Computer Programming Language BHIS Branch if Higher or Same
BCR Byte Count Register BI Binary Input
BCS Bar Code Sorter .BIB Bibliography (file name extension)
BDA Bios Data Area BiDi Bi-Directional
BDC Backup Domain Controller BIFET Bipolar Field Effect Transistor
BDE Borland Database Engine [Borland] BIFF Binary Interchange File Format
BDLS Bidirectional Loop Switching BIM Beginning of Information Marker
BDOS Basic Disk Operating System .BIN Binary (file name extension)
BDR Bus Device Request BINAC * Binary Automatic Computer
BDSL Broadband ADSL BIND Berkeley Internet Name Domain
BE Below or Equal BINHEX Binary Hexadecimal
BECN Backward Explicit Congestion Notification BIOS Basic Input/Output System
BEDO Burst Extended Data Out BIS Business Information System
BEL Bell BISDN Broadband Integrated Services Digital Network
BELLCORE Bell Communications Research BIST Built-In Self-Test
BER Basic Encoding Rules + Bit Error Rate BiSYNC (See BSYNC)
BERT Bit Error Rate Test/Tester BIT Binary Digit
BF Bad Flag BITNET Because It's Time Network
B/F Background/Foreground BITNIC Bitnet Network Information Center
BFF Binary File Format [IBM] BIU Bus Interface Unit
BFT Binary File Transfer BIX Byte Information Exchange (BBS)
BFTP Batch FTP BIZ. Business [USENET Newsgroup Category]
BGA Ball Grid Array .BK! Backup (file name extension) [WordPerfect]
BGCOLOR Background Color [HTML] .B~K Backup (file name extension)
BGE Branch if Greater or Equal BKSP Backspace BL Backlit + Bit Line BORQU Borland Quattro
BLAST Blocked Asynchronous Transmission (protocol) BOS Basic Operating System
[Communications Research Group] BOT Beginning Of Table + Beginning of Tape + Robot
.BLD BASIC Bload Graphics (file name extension) BP Base Pointer
BLE Branch if Less or Equal BPB BIOS Parameter Block
BLER Block Error BPDU Bridge Protocol Data Unit
BLK Block BPI Bits Per Inch
BLMC Buried Logic Macrocell BPL Branch if Plus
BLOB Binary Large Object BPS Bits Per Second + Bytes Per Second
BLOS Branch if Lower Or Same BR Bad Register
BMI Branch if Minus BRGC Binary Reflected Gray Code
BMIC BusMaster Interface Controller [Intel] BRI Basic Rate Interface + Brain Response Interface
BMP Basic Mapping Support + Batch Message Processing Program BS Backspace
.BMP Bitmap (file name extension) [Paintbrush Format] BSAM Basic Sequential Access Method
BNC Bayonet Neill-Concelman (connector used with BSC Binary Synchronous Communication
coaxial cable invented by Mr. Neill-Concelman) .BSC Boyan Script (file name extension) [Boyan Communications]
BNE Branch if Not Equal BSCS Bachelor of Science (Degree) in Computer Science
BNF Backus-Naur Form (also Backus-Normal Form) [developed by BSD Berkely Software/Standard Distribution
John Backus and Peter Naur] BSF Bit Scan Forward
BNS Backbone Network Service BSI British Standards Institute
BO Binary Output BSP Bulk Synchronous Parallelism
BoB Break-out Box BSR Bit Scan Reverse
BOC Basic Operator Console BSS Block Started by Symbol
BOF Beginning Of File BSV BASIC Bsave Graphics (file name extension)
BOM Beginning Of Message BSY Busy
BOND Bandwidth On Demand BSYNC Binary Synchronous Communications (protocol)
BOOTP Bootstrap Protocol [Internet] BT Bit Test
BOPS Billion Operations Per Second BTAM Basic Telecommunications Access Method [IBM]
BORPQU Borland Pro Quattro BTB Branch Target Buffer BTC Bit Test and Complement CAM Common Access Method + Computer Aided Manufacturing +
BTOA Binary To ASCII Contents Addressable Memory
BTP Batch Transfer Program CAN Cancel
BTR Bit Test and Reset CAP Carrierless Amplitude and Phase-Modulation +
BTS Bit Test and Set Central Arbitration Point +
BU Branch Unit Communication Application Platform +
BUBL Bulletin Board for Libraries [Janet] Competitive Access Provider +
BUF Buffer Computer Aided Publishing
BUS Broadcast and Unknown Server .CAP Capture (file name extension)
BVH Base Video Handler CAPD Computing To Assist Persons With Disabilities [Johns
BWM Block-Write Mode Hopkins University]
B2X Binary To Hexadecimal [REXX] CAPS Capitals (Upper Case Letters) +
BYTE Binary Element String Cassette Programming System
CARL Colorado Alliance of Research Libraries [Internet]
C.. CAS Column Address Select +
Communications Application Specification + C C Programming Language
Computer Aided Styling .C C source code (file name extension) [C]
CASE Computer Aided Software Engineering CA Collision Avoidance
CASL Crosstalk Application Scripting Language [DCA] .CAB Cabinet (file name extension) [Microsoft]
CASS Computer Assisted Search Service CAD Computer Aided Design
CASSIS Classified and Search Support Information System CADD Computer Aided Design and Drafting
CAT Computer Adaptive Test + Computer Aided Testing + CADE Client/server Application Development Environment
Computer Aided Tomography + CAE Client Application Enabler +
Computer Aided Transcription + Concatenate Common Applications Environment + Computer Aided Engineering
.CAT Catalog (file name extension) CAEX Computer Aided Exploration
CATS Computer Assisted Training System CAG Column Address Generator
CAT SCAN Computerized Axial Tomography Scan CAI Computer Aided Instruction
CATV Community Antenna Television (this was the original CAL Calendar + Computer Aided Learning
name for what is now known as Cable TV) CALS Computer-Aided Acquisition in Logistic Support CAU Controlled Access Unit .CCS Color Calibration System (file name extension)
CAV Constant Angular Velocity CCSD Cellular Circuit-Switched Data
CBC Cipher Block Chaining CD Carrier Detect + Change Directory +
CBCR Channel Byte Count Register Collision Detection + Color Display + Compact Disk
CBDS Connectionless Broadband Data Service C/D Control Data
CBEMA Computer and Business Equipment C2D Character To Decimal [REXX]
Manufacturers Association CDA Compound Document Architecture [DEC]
CBGA Ceramic Ball Grid Array CDC Control Data Corporation
CBI Computer Based Instruction CD_CHRDY Card Channel Ready [IBM]
CBL Computer Based Learning CD-DA Compact Disk -Digital Audio
.CBL COBOL source code (file name extension) CDDI Copper Distributed Data Interface
CBMS Computer-Based Mail System CDE Common Desktop Environment + Complex Data Entry
CBR Case Based Reasoning + Constant Bit Rate CD-E Compact Disk - Erasable
CBT Computer Based Training CDF Channel Definition Format
CBW Convert Byte to Word .CDF Comma Delimited Format (file name extension)
CBX Computer-Controlled Branch Exchange CDFS Compact Disc File System [Microsoft]
CC Cluster Controller CD+G Compact Disk plus Graphics
CC: Carbon Copy CD-I Compact Disk - Interactive
CCD Charged-Coupled Device CDIA Certified Document Imaging Architect
CCFT Cold Cathode Fluorescent Tube CDL Computer Design Language
CCI Common Client Interface CDMA Code Division Multiple Access
CCITT Comite Consultatif International Telegraphique et CDMF Commercial Data Masking Facility [IBM] Telephonique/ CD-MO Compact Disk - Magneto Optical Consultative Committee for International Telegraph and Telephone CDOS Concurrent Disk Operating System CCL Connection/Cursor Control Language CDPD Cellular Digital Packet Data CCP Console Command Processor CDR Call Detail Record + Call Detail Recording CCS Common Command Set + Common Communications Services + CD-R Compact Disk - Recordable
Common Communications Support + CD-RDx Compact Disk - Read Only Memory Data Exchange Standard
Continuous Composite Servo CDRL Contract Data Requirements List CD-ROM Compact Disk - Read Only Memory CGE Common Graphics Environment
CD-RTOS Compact Disk - Real Time Operating System CGI Common Gateway Interface + Computer Generated Images +
CD-RW Compact Disk - Re-Writable Computer Graphics Interface
CDS Current Directory Structure .CGM Computer Graphics Metafile (file name extension) +
CDSA Common Data Security Architecture Graph (file name extension) [Lotus 1-2-3] [LDC]
.CDT Corel Draw Template (file name extension) CHAP Challenge-Handshake Authentication Protocol
CD-V Compact Disk - Video CHAR Character
CD-WO Compact Disk - Write Once CHAT Conversational Hypertext Access Technology [Internet]
.CDX Compound Index (file name extension) [Fox Pro] CHCK Channel Check
CD-XA Compact Disk - Extended Architecture CHCP Change Code Page
CE Cache Enable + Chip Enable + Collision Elimination + CHDIR Change Directory
Convert Enable CHFN Change Finger [Unix]
CEG Continuous Edge Graphics CHGRP Change Group
CEI Conducted Electromagnetic Interference .CHK CHKDSK (file name extension)
CELP Card Edge Low Profile (socket) [Intel] CHKDSK Check Disk
CEMS Constituent Electronic Mail System CHMOD Change Mode
CEOP Conditional End Of Page CHOWN Change Owner
CER Canonical Encoding Rules CHP Chapter
CERN The European Particle Physics Laboratory (initials CHR Character
originally from Conseil European pour la Recherche Nucleaire) CHRP Common Hardware Reference Platform
CERT Computer Emergency Response Team CHS Cylinder Head Sector
CFB Cipher Feedback + Configurable Function Block CI Component Interface
.CFG Configuration (file name extension) CIA Current Instruction Address
CFM Code Fragment Manager [Macintosh] CIAC Computer Incident Advisory Capability
CFR Computerized Facial Recognition CICS/VS Customer Information Control System/
CFS Caching/Common File System Virtual Storage [IBM]
CFV Call For Votes [Bitnet] CID Charge-Injection Device +
CG Control Gate Configuration/Installation/Distribution
CGA Color Graphics Adapter CIDR Classless Inter-Domain Routing