Computer Directory from A to A

2DD              double-side double density
2HD              double-side high density
3D DDI          3 Dimensional Device Driver Interface
4GL               4th generation language
4GT               4 GB Ram Tuning

AA        Auto Answer

AAB       All-to-All Broadcast

AAL       Asynchronous Transfer Mode Adaption Layer

AAP       Applications Access Point [DEC]

AAS       All-to-All Scatter

AASP      ASCII Asynchronous Support Package

AAT       Average Access Time

ABC    *  Atanasoff-Berry Computer  (First digital

          calculating machine that used vacuum tubes)

ABEND     Abnormal End

ABI       Application Binary Interface

ABIOS     Advanced BIOS

ABIST     Automatic Built-In Self-Test [IBM]

ABLE      Adaptive Battery Life Extender

ABR       Available Bit Rate

ABRS      Automated Book Request System [British Library]

ABS       Absolute

ABT       Abort

ABTS      ASCII Block Terminal Services

AC        Autocheck + Automatic Computer + Alternating Current

ACC       Accumulator

ACD       Automated Call Distribution +

          Automatic Call Distributor

ACDI      Asynchronous Communications Device Interface

ACE       Advanced Computing Environment [SCO] +

          Adverse Channel Enhancements [Microcom] +

       *  Automatic Computing Engine

ACF       Access Control Field +

          Advanced Communications Function

ACH       Automated Clearing House

ACIAS     Automated Calibration Interval Analysis System

ACIS      American Committee for Interoperable Systems

ACK       Acknowledgment

ACL       Access Control List

ACM       Association for Computing Machinery

          Audio Compression Manager [Microsoft]

ACMS      Application Control Management System

ACP       Ancillary Control Program +

          Auxillary Control Process

ACROSS    Automated Cargo Release and Operations

          Service System

ACS       Access + Access Control Set +

          Access Control System +

          Asynchronous Communication Server

ACTS      Automated Computer Time Service

ACTT      Advanced Communication and Timekeeping

          Technology [Seiko]

ACU       Automatic Calling Unit

A/D       Analog to Digital

ADA       Automatic Data Acquisitions + Programming

          Language named after Augusta Ada Lovelace)

ADB       Apple Desktop Bus

ADC       Adaptive Data Compression (protocol) [Hayes] +

          Add with Carry + Analog to Digital Converter

ADCCP     Advanced Data Communication Control Procedures

ADD       Automatic Document Detection [WordPerfect]

ADF       Automatic Document Feeder +

          Automatically Defined Function

.ADF      Adapter Description File (file name extension)

ADI       AutoCad Device Interface (driver)

ADL       Address Data Latch

ADLAT     Adaptive Lattice Filter

ADLC      Adaptive Lossless Data Compression [IBM] +

          Asynchronous Data Link Control

ADMACS    Apple Document Mangagement And Conrol System

ADMD      Administrative Management Domain [X.400]

.ADN      Add In Utility (file name extension)

          [Lotus 1-2-3] [LDC]

ADP       Automatic Data Processing

ADPCM     Adaptive Differential Pulse Code Modulation

ADR       Address

ADS       Application Development Solutions [AT&T] +

          Application Development System +

          Automatic Distribution System

ADSC      Address Status Changed +

          Adobe Document Structuring Conventions

ADSL      Asymmetrical Digital Subscriber Line

ADSR      Attack, Decay, Sustain, Release

ADT       Application Data Types

ADU       Automatic Dialing Unit

AE        Above or Equal

AEB       Analog Expansion Bus [Dialogic]

AF        Auxiliary carry Flag

AFA       Accelerated File Access

AFC       Automatic Font Change + Automatic Frequency Control

AFD       Automatic File Distribution

AFII      Association for Font Information Interchange

AFIRM     Automated Fingerprint Image Reporting and Match

AFIS      Automated Fingerprint Identification System

.AFM      Adobe Font Metrics (file name extension)

          [Adobe Systems]

AFP       Appletalk Filing Protocol [Macintosh]

AFS       Andrew File System (protocols)

AFTP      Anonymous File Transfer Protocol

AGC       Automatic Gain Control

AGRAS     Antiglare-Antireflective-Antistatic

AGU       Address-Generation Unit

AI        Analog Input + Artificial Intelligence

AIA       Applications Integration Architecture [DEC]

AIC       AIXwindows Interface Composer [IBM]

AIF       Audio Interchange Format

AIIM      Association for Information and Image Management

AIN       Advanced Intelligent Network [Bell Atlantic]

AIS       Automated Identification System [NCIC]

AISB      Association of Imaging Service Bureaus

AISP      Association of Information Systems Professionals

AIX       Advanced Interactive Executive [IBM]

ALC       Arithmetic and Logic Circuits +

          Automatic Level Control

ALE       Address Latch Enable

ALGOL     Algorithmic Oriented Language (see IAL)

ALIBI     Adaptive Location of Internetworked Bases

          of Information

ALINK     Active Link [HTML]

ALIWEB    Archie Like Indexing in the Web [Internet]

ALN       Asynchronous Learning Network

ALR       Advanced Logic Research, Inc.

ALT       Alternate (mode)

ALT.      Alternate lifestyle [USENET Newsgroup Category]

ALU       Arithmetic Logic Unit

AMANDDA   Automated Messaging and Directory Assistance

AMD       Active Matrix Display +

          Advanced Micro Devices, Inc.

AMI       American Megatrends, Inc.

AMMA      Advanced Memory Management Architecture

          [Everex Systems]

AMPS      Advanced Mobile Phone Service

ANCOVA    Analysis of Covariance

ANDF      Architecture-Neutral Distribution Format

ANI       Automatic Number Identification

.ANI      Animated Cursor (file name extension) [Microsoft]

ANN       Artificial Neural Network

.ANN      Annotations (file name extension) [IBM]

ANOVA     Analysis Of Variance

ANSI      American National Standards Institute

AO        Analog Output

AOCE      Apple Open Collaboration Environment

AOE       Application Operating Environment [AT&T]

AOL       America Online

AOS       Add Or Subtract

AP        Adjunct Processor + Application Processor

A/P       Accounts Payable

APA       Adaptive Packet Assembly +

          All Points Addressable +

          Arithmetic Processing Accelerator

APAR      Authorized Program Analysis Report [IBM]

APAREN    Address Parity Enable [IBM]

APCUG     Association of PC User Groups

API       Application Program Interface

APIC      Advanced Programmable Interrupt Controller (bus) [Intel]

APIS      Advanced Passenger Information System

APL       A Programming Language (Mathematics)

APM       Advanced Power Management [IBM OS2]

.APP      Application (file name extension) [R:Base]

APPC      Advanced Program-to-Program Communications [IBM]

APPI      Advanced Peer-to-Peer Internetworking

APPN      Advanced Peer-to-Peer Networking [IBM]

APPS      Applications

APRP      Adaptive Pattern Recognition Processing

APS       Advanced Photo System + Advanced Printing Service [IBM]

          Asynchronous Protocol Specification

APSE      ADA Programming Support Environment

APT       Address Pass Through +

          Advanced Parallel Technology +

          Automatically Programmed Tools

A/R       Accounts Receivable

ARA       AppleTalk Remote Access

ARAG      Antireflective-Antiglare

ARAS      Antireflective-Antistatic

.ARC      Archive (file name extension)

ARCA      Advanced RISC Computing Architecture

ARCnet    Attached Resource Computer Network

.ARJ      Compressed File (file name extension) [Jung]

ARL       Adjusted Ring Length

ARLL      Advanced Run Length Limited

ARM       Advanced RISC Machine (processor) +

          Annotated Reference Manual +

          Asynchronous Response Mode

ARMA      Association of Records Managers and Administrators

ARP       Address Resolution Protocol [Novell]

ARPANET   Advanced Research Projects Agency Network

ARPL      Adjust Requested Privilege Level

ARTA      Apple Real Time Architecture

ARTIC     A Real-Time Interface Copressor [IBM]

ARTS      Asynchronous Remote Takeover Server

ARTT      Asynchronous Remote Takeover Terminal

ARQ       Automatic Repeat Request

ARU       Audio Response Unit

AS        Autonomous System [Internet]

ASAP      As Soon As Possible +

          Automatic Switching And Processing

AS3AP     ANSI SQL Standard Scalable and Portable

.ASC      ASCII text (file name extension)

ASCII     American Standard Code for Information Interchange

ASIC      Application-Specific Integrated Circuit

ASIT      Advanced Security and Identification Technology

ASL       Adaptive Speed Levelling

ASLM      Apple Shared Library Manager [Macintosh]

.ASM      Assembler Source Language (file name extension)

ASMP      Asymmetric Multprocessing

ASN       Abstract Syntax Notation +

          Autonomous System Number

ASP       Association of Shareware Professionals

ASPI      Advanced SCSI Programming Interface [Adaptec]

ASPS      Advanced Signal Processing System

ASR       Address Space Register + Automatic Send-Receive +

          Automatic Speech Recognition

AST       AST Research, Inc. (named from first initials of

          the founders: Albert Wong, Safi Qureshey, Thomas Yuen)

AS/U      Advanced Server for Unix

ASYNC     Asynchronous

AT        Advanced Technology + Attention

ATA       Advanced Technology Attachment

ATDP      Attention Dial Pulse

ATDT      Attention Dial Tone

ATE       Automated Test Equipment

ATG       Advanced Technology Group

ATH       Attention Hang-Up (Modem command)

ATM       Adobe Typeface Manager +

          Asynchronous Transfer Mode +

          Automated Teller Machine

ATPS      AppleTalk Printing Services [Macintosh]

ATR       Automatic Terminal Recognition

ATS       Administrative Terminal System +

          Apple Terminal Services

AT&T      American Telephone and Telegraph

ATTN      Attention

ATTRIB    Attribute (also ATR)

ATZ       Attention Restore configuration profile from

          nonvolatile RAM (Modem command)

.AU       Audio (file name extension)

AUDIT     Automated Data Input Terminal

AUI       Attachment Unit Interface

AUP       Acceptable Use Policy [Internet]

AUTO      Automatic

AUTOEXEC  Automatic Execution

AUX       Auxiliary + (First Serial Port)

AV        Audio/Video + Audiovisual + Authenticity Verification

AVA       Audio Visual Authoring [IBM]

AVC       Audio Visual Connection [IBM]

AVG       Average

AVI       Audio Visual Interleave [Microsoft]

AVR       Automatic Voice Recognition

AWG       American Wire Gage

AWK       (Unix language named after its authors...

          Al Aho, Peter Weinberger and Brian Kernighan)

AWS       Advanced Workstations and Systems (group) [IBM]

AX        Architecture Extended + Automatic Transmission