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]