3WC - 3-Way Calling

AAD - Analog Alignment Diskette
AAL - ATM Adaption Layer
ABC - Atanasoff-Berry Computer
ABE - Agent Building Environment
ABIOS - Advanced Basic Input / Output System
ABR - Available Bit Rate
AC - Alternating Current
ACF - Advanced Communications Function
ACK - Acknowledgement
ACL - Access Control List
ACPI - Advanced Configuration and Power Interface
ACS - Automatic Class Selection
ADC - Analog Digital Converter
ADCCP - Advanced Data Communications Control Procedures
ADM - Add / Drop Multiplexers
ADP - Automated Data Processing
ADPCM - Adaptive Differential Pulse Code Modulation
ADSC - Adobe Document Structuring Conventions
ADSI - Active Directory Services Interface
ADSL - Asymmetric Digital Subscriber Line
AF - Auxillary-carry Flag
AFC - Automatic Frequency Control
AFP - AppleTalk File Protocol
AGC - Automatic Gain Control
AGIS - Apex Global Information Services
AGP - Accellerated Graphics Port
AI - Artificial Intelligence
AIMUX - ATM Inverse Multiplexing
AIN - Advanced Intelligent Network
AIS - Alarm Indication Signal
AIX - Advanced Interactive Executive
AKM - Apogee Kick Motor
ALI - Acer Laboratories, Inc.
ALIVE - Artificial Life Interactive Video Environment
AM - Amplitude Modulation
AMD - Advanced Micro Devices
AMI - Alternative Mark Inversion
AMI - American Megatrends, Inc.
AMON - ATM Monitoring
AMS - Access Method Services
ANA - Automatic Number Announcement
ANI - Automatic Number Identification
ANSI - American National Standards Institute
AOL - America On-Line
APA - All Points Addressable
APC - American Power Conversion
API - Application Program Interface
APM - Advanced Power Management
APPC - Advanced Program-to-Program Communications
ARC - Attached Resources Computing
ARIES - ATM Research & Industrial Enterprise Study
ARLL - Advanced Run Length Limited
ARP - Address Resolution Protocol
ARPA - Advanced Research Projects Agency
ARPANET - Advanced Research Projects Agency Network
ARQ - Automatic Repeat Request
AS - Autonamous Systems
ASAP- Any Service / Any Port
ASCII - American Standard Code for Information Interchange
ASG - Advanced Systems Group
ASIC - Application Specific Integrated Circuit
ASME - American Society of Mechanical Engineers
ASP - Association Of Shareware Professionals
ASPI - Advanced SCSI Programming Interface
ASR - Automatic Send / Recieve
AST - Asynchronous System Trap
AT- Advanced Technology
AT- Attention
ATA - Advanced Technology Attachment
ATAPI - Advanced Technology Attachment Packet Interface
AT&T- American Telephone & Telegraph
ATM - Adobe Type Manager
ATM - Asynchronous Transfer Mode
ATM - Automated Teller Machine
AUI - Attachment Unit Interface
AVI - Audio / Video Interleaved
AVN - Ameritech Virtual Network
AWB - Aglets Workbench
AXP - Almost Exactly Prism