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Glossary of Computer Terms (5C) ****************************
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*********************** Updated:05/16/2008 Copyright © 1996-2008 Management Systems Consulting, Inc. |
A...| TOP | DN to B | BOTTOM |AA Auto Answer
AAA Authentication, Authorization and Accounting
AAB All-to-All Broadcast
AAC Advanced Audio Coding
AAL Asynchronous Transfer Mode Adaption Layer
AAM Automatic Acoustic Management
AAP Applications Access Point [DEC]
AARP AppleTalk Address Resolution Protocol
AAS All-to-All Scatter
AASP ASCII Asynchronous Support Package
AAT Average Access Time
AATP Authorized Academic Training Program [Microsoft]
.ABA Address Book Archive (file name extension) [Palm]
ABAP Advanced Business Application Programming [SAP]
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 +
Agent Building and Learning Environment [IBM]
ABM Asynchronous Balanced Mode
ABR Available Bit Rate
ABRD Automatic Baud Rate Detection
ABRS Automated Book Request System [British Library]
ABS Address Book Synchronization [IBM] + Absolute
ABT Abort
ABTS ASCII Block Terminal Services
AC Autocheck + Automatic Computer + Alternating Current
ACAP Application Configuration Access Protocol
ACC Accumulator
ACCMAIL Accessing the Internet Via Email
ACD Automatic Call Distribution
ACDI Asynchronous Communications Device Interface
ACE Access Control Encryption/Entry +
Adobe Certified Expert +
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 + Asynchronous Connection-Less (link)
ACM Association for Computing Machinery
Audio Compression Manager [Microsoft]
ACMS Application Control Management System
ACP Ancillary Control Program + Auxiliary Control Process
ACPI Advanced Configuration and Power Interface
ACR Allowed Cell Rate
ACROSS Automated Cargo Release and Operations
Service System
ACS Access + Access Control Set + Access Control System +
* Advanced Computer System [IBM] +
Anti Curl System + Asynchronous Communication Server
ACSS Audio Cascading Style Sheets
ACTLU Active Logical Unit
ACTPU Active Physical Unit
ACTS Automated Computer Time Service
ACTT Advanced Communication and Timekeeping Technology [Seiko]
ACU Automatic Calling Unit
ACVC Ada Compiler Validation Capacity
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/Protocol
ADD Automatic Document Detection [WordPerfect]
ADF Automatic Document Feeder +
Automatically Defined Function
.ADF Adapter Description File (file name extension)
ADI AutoCad/AutoDesk Device Interface (driver)
ADIOS Automated Download and Installation of
Operating Systems [Queensland U.]
ADL Address Data Latch
ADLAT Adaptive Lattice Filter
ADLC Adaptive Lossless Data Compression [IBM] +
Asynchronous Data Link Control
ADMACS Apple Document Management And Conrol System
ADMD Administrative Management Domain [X.400]
.ADN Add In Utility (file name extension)
[Lotus 1-2-3] [LDC]
ADO ActiveX Data Objects
ADP AOLserver Dynamic Pages + 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
ADSI Active Directory Service Interface [Microsoft] +
Analog Display Services Interface
ADSL (See DSL)
ADSP AppleTalk Datastream Protocol
ADSR Attack, Decay, Sustain, Release
ADT Abstract Data Type + Application Data Types
ADU Automatic Dialing Unit
AE Above or Equal
AEB Analog Expansion Bus [Dialogic]
AEC Architecture, Engineering, Construction
AEM Asynchronous Event Mechanism
.AERO Aviation Industry (Domain Name) [Internet]
AES Advanced Encryption Standard
AESA ATM End System Address
AF Auxiliary carry Flag
AFA Accelerated File Access
AFC Antiferro-Magnetically Coupled (media) [IBM] +
Automatic Font Change + Automatic Frequency Control
AFD Automatic File Distribution
AFDW Active Framework for Data Warehousing [Microsoft]
AFI Authority and Format Identifier
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 Advanced Function Presentation [IBM] +
Advanced Function Printing +
Appletalk Filing Protocol [Macintosh]
AFS Andrew File System (protocols)
AFTP Advanced/Anonymous File Transfer Protocol
AGA Advanced Graphics Adapter
AGC Automatic Gain Control
AGP Accelerated/Advanced Graphics Port
AGRAS Antiglare-Antireflective-Antistatic
AGU Address-Generation Unit
AH Authentication Header (protocol)
AHS Automated Highway Systems
AI Analog Input + Artificial Intelligence
AIA Applications Integration Architecture [DEC]
AIC AIXwindows Interface Composer [IBM]
AIFF Audio Interchange File Format
AIIM Association for Information and Image Management
AIM AOL Instant Messenger
AIN Advanced Intelligent Network [Bell Atlantic]
AIO All-In-One
AIP Application Infrastruture Provider
AIR Architecture Implementation Review
AIS Automated Identification System [NCIC] +
Automated Information Systems
AISB Association of Imaging Service Bureaus
AISP Association of Information Systems Professionals
AIT Advanced Intelligent Tape (drive) [Sony]
AIX Advanced Interactive Executive [IBM]
AJAX Asynchronous JavaScript and XML
ALAT Advanced Load Address Table
ALC Arithmetic and Logic Circuits +
Automatic Level Control
ALE Address Latch Enable +
Application Linking and Embedding
ALGOL Algorithmic Oriented Language (see IAL)
ALIBI Adaptive Location of Internetworked Bases
of Information
ALICE Artificial Linguistic Internet Computer Entity
ALINK Active Link [HTML]
ALIWEB Archie Like Indexing in the Web [Internet]
ALN Asynchronous Learning Network
ALOS Alternate Lighting Of Surfaces
ALP Automatic Language Processing
ALR Advanced Logic Research, Inc.
ALT Alternate (mode)
ALT. Alternate lifestyle [USENET Newsgroup Category]
ALU Arithmetic Logic Unit
AM Amplitude Modulation
AMA Automatic Message Accounting
AMANDDA Automated Messaging and Directory Assistance
AMASS Archival Management and Storage System
AMD Active Matrix Display + Advanced Micro Devices, Inc.
AMDD Agile Modelling Driven Development
AMI Alternate Mark Inversion + American Megatrends, Inc. +
Application Messaging Interface
AMMA Advanced Memory Management Architecture [Everex Systems]
AMPL Algebraic/Applied Mathematical Programming Language
AMPS Advanced Mobile Phone Service + Amplifiers
AMR Audio Modem Riser
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
ANX Automotive Network Exchange [Chrysler/Ford/
General Motors]
AO Analog Output
AOCE Apple Open Collaboration Environment
AO/DI Always On/Dynamic ISDN
AODV Ad Hoc On-Demand Distance Vector
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
APDU Application Protocol Data Units
API Application Program Interface
APIC Advanced Programmable Interrupt Controller (bus) [Intel]
APIPA Automatic Private Interenet Protocol Addressing
APIS Advanced Passenger Information System
APL * A Programming Language (Mathematics)
APM Advanced Power Management [IBM]
APNIC Asia-Pacific Network Information Center [Internet]
APOP Authenticated Post Office Protocol
.APP Application (file name extension) [R:Base]
APPC Advanced Program-to-Program Communications [IBM]
APPI Advanced Peer-to-Peer Internetworking
APPLETS Applications
APPN Advanced Peer-to-Peer Networking [IBM]
APPS Applications
APR Annual Percentage Rate
APRP Adaptive Pattern Recognition Processing
APS Active Pixel Sensor + 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 Acoustic Resonance Control
.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
ARS Activity Reporting System [Unisys]
ART Adaptive Resonance Theory (algorithm)
ARTA Apple Real Time Architecture
ARTIC A Real-Time Interface Coprocessor [IBM]
ARTS Asynchronous Remote Takeover Server
.ARTS Cultural Groups (Domain Name) [Internet]
ARTT Asynchronous Remote Takeover Terminal
ARQ Automatic Repeat Request
ARU Audio Response Unit
AS Autonomous System [Internet]
ASAI Adjunct Switch Application Interface [AT&T]
ASAP As Soon As Possible +
Automatic Switching And Processing
AS3AP ANSI SQL Standard Scalable and Portable
ASB Advanced System Buffering [Intel]
.ASC ASCII text (file name extension)
ASCC * Automatic Sequence Controlled Calculator [IBM]
ASCII American Standard Code for Information Interchange
ASD Application Structure Database [Microsoft] +
Automatic Skip Driver [Microsoft]
ASF Active/Advanced Streaming Format [Microsoft]
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
ASO Automated Systems Operations
ASP Active Server Page [Microsoft] +
Application/Authorized Service Provider +
Aspect Oriented Programming +
Association of Shareware Professionals
.ASP Active Server Page (file name extension)
ASPI Advanced SCSI Programming Interface [Adaptec]
ASPS Advanced Signal Processing System
ASR Address Space Register + Automatic Send-Receive +
Automatic Speech Recognition +
Automatic System Recovery
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
AS/400 Application System/400 [IBM]
AT Advanced Technology + Attention
ATA Advanced Technology Attachment
ATAPI Advanced Technology Attachment Packet Interface
ATC Advanced Transfer Cache
ATDP Attention Dial Pulse
ATDT Attention Dial Tone
ATE Automated Test Equipment
ATG Advanced Technology Group
ATH Attention Hang-Up (Modem command)
ATL Active Template Library
ATM Adobe Typeface Manager + Air Traffic Management +
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)
ATX Advanced Technology Extended [Intel]
ATZ Attention Restore configuration profile from
nonvolatile RAM (Modem command)
.AU Audio (file name extension)
AUDIT Automated Data Input Terminal
AUI Attachment/Autonomous Unit Interface
AUP Acceptable Use Policy [Internet]
AUTO Automatic
AUTOEXEC Automatic Execution
AUX Auxiliary + (First Serial Port)
AV Audio/Video + Audio/Visual + Authenticity Verification
AVA Audio Visual Authoring [IBM]
AVC Audio Visual Connection [IBM]
AVD Alternating Voice and Data
AVG Average
AVI Audio Video Interleave [Microsoft]
AVL AVL Tree (named after its founders:
Adelson, Veiskii and Landis
AVP Attribute-Value Pair
AVR Automatic Voice Recognition
AVT Applied Voice Technology
AVVID Architecture for Voice Video & Integrated Data [Cisco]
AWE Advanced Wave Effects [Creative Lab]
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]
AWT Abstract Window Toolkit [Java]
AX Architecture Extended + Automatic Transmission
B...| TOP | UP to A | DN to C | BOTTOM |BA Bell Atlantic (company)
BACP Bandwidth Allocation Control Protocol
BAK Binary Adaptation Kit [Microsoft]
.BAK Backup (file name extension)
BAL Basic Assembly Language
BALUN Balanced Unbalanced (device)
BAM Boyan Action Module
BAPI Business Application Programming Interface [SAP]
BARTS Bell Atlantic Regional Timesharing
.BAS Basic Language (file name extension)
BASH Bourne Again Shell [Unix]
BASIC Beginner's All-purpose Symbolic Instruction Code
BASM Built-In Assembler
BAT Block Address Translation
.BAT Batch Processing (file name extension)
B2B Business-To-Business
BBS Bulletin Board System
B2C Business To Consumer
BCC Block Check Character
BCC: Blind Carbon Copy
BCD Binary Coded Decimal
B-CHANNEL Bearer Channel
BCL Base Class Libraries + Batch Command Language
BCN Beacon
BCNF Boyce-Codd Normal Form
BCP Best Current Practice + Bulk Copy Program
BCPL Basic Computer Programming Language
BCR Byte Count Register
BCS Bar Code Sorter
BDA Bios Data Area
BDC Backup Domain Controller
BDE Borland Database Engine [Borland]
BDLS Bidirectional Loop Switching
BDOS Basic Disk Operating System
BDR Bus Device Request
BDSL (See DSL)
BE Below or Equal
B2E Business To Employees
BECN Backward Explicit Congestion Notification
BEDO Burst Extended Data Out
BEEP Blocks Extensible Exchange Protocol
BEL Bell
BELLCORE Bell Communications Research
BER Basic Encoding Rules + Bit Error Rate
BERT Bit Error Rate Test/Tester
BF Bad Flag
B/F Background/Foreground
.BFC Briefcase (file name extension) [Microsoft]
BFF Binary File Format [IBM]
BFT Binary File Transfer
BFTP Batch FTP
BGA Ball Grid Array
BGCOLOR Background Color [HTML]
BGE Branch if Greater or Equal
.BGI Borland Graphic Interface (file name extension)
BGP Border Gateway Protocol
BGT Branch if Greater Than
BHI Branch if Higher
BHIS Branch if Higher or Same
BHO Browser Helper Object [Spybot]
BI Binary Input
.BIB Bibliography (file name extension)
BiDi Bi-Directional
BIFET Bipolar Field Effect Transistor
BIFF Binary Interchange File Format
BIM Beginning of Information Marker
.BIN Binary (file name extension)
BINAC * Binary Automatic Computer
BIND Berkeley Internet Name Domain
BINHEX Binary Hexadecimal
BIOS Basic Input/Output System
BIS Business Information System
BISDN Broadband Integrated Services Digital Network
BIST Built-In Self-Test
BiSYNC (See BSYNC)
BIT Binary Digit
BITNET Because It's Time Network
BITNIC Bitnet Network Information Center
BIU Bus Interface Unit
BIW Business Intelligence Warehouse [SAP]
BIX Byte Information Exchange (BBS)
.BIZ Businesses (Domain Name) [Internet]
.BK! Backup (file name extension) [WordPerfect]
.B~K Backup (file name extension)
BKSP Backspace
BL Backlit + Bit Line
BLAST Bell Labs Layered Space Time +
Blocked Asynchronous Transmission (protocol)
[Communications Research Group]
.BLD BASIC Bload Graphics (file name extension)
BLE Branch if Less or Equal
BLER Block Error
BLI Business Logic Integration [Microsoft]
BLK Block
BLMC Buried Logic Macrocell
BLOB Binary Large Object
BLOG Web Log
BLOS Branch if Lower Or Same
BMI Branch if Minus
BMIC BusMaster Interface Controller [Intel]
BMP Basic Mapping Support + Basic Multilingual Plane +
Batch Message Processing Program
.BMP Bitmap (file name extension) [Paintbrush Format]
BNC Bayonet Neill-Concelman (connector used with
coaxial cable invented by Mr. Neill-Concelman) +
British Naval Connector
BNE Branch if Not Equal
BNF Backus-Naur Form (also Backus-Normal Form) [developed by
John Backus and Peter Naur]
BNS Backbone Network Service
BO Binary Output
BOA Basic Object Adapter
BOB Break-out Box
BOC Basic Operator Console
BOF Beginning Of File
BOM Basic Online Memory [IBM] + Beginning Of Message
BOND Bandwidth On Demand
BOOTP Bootstrap Protocol [Internet]
BOPS Billion Operations Per Second
BORPQU Borland Pro Quattro
BORQU Borland Quattro
BOS Basic Operating System
BOT Beginning Of Table + Beginning of Tape + Robot
BP Base Pointer
BPB BIOS Parameter Block
BPDU Bridge Protocol Data Unit
Berkeley Packet Filter
BPI Bits Per Inch
BPL Branch If Plus + Broadband Over Power Lines
BPM Business Process Management [Microsoft]
BPP Bits Per Pixel
BPR Business Process Re-engineering [Linux]
BPS Bits Per Second + Bytes Per Second
BPSK Binary Phase Shift Keying
BR Bad Register
BRGC Binary Reflected Gray Code
BRI Basic Rate Interface + Brain Response Interface
BS Backspace
BSAM Basic Sequential Access Method
BSC Base Station Controller + Binary Synchronous Communication
.BSC Boyan Script (file name extension) [Boyan Communications]
BSCS Bachelor of Science (Degree) in Computer Science
BSD Berkely Software/Standard Distribution
BSF Bit Scan Forward
BSI British Standards Institute
BSM Basic Storage Module [IBM]
BSP Bulk Synchronous Parallelism
BSR Bit Scan Reverse
BS-RAM Burst Static RAM
BSS Block Started by Symbol
BST Binary Search Tree
BSY Busy
BSYNC Binary Synchronous Communications (protocol)
BT Bit Test
BTAM Basic Telecommunications Access Method [IBM]
BTB Branch Target Buffer
BTC Bit Test and Complement
BTI Business Type Identifier
BTOA Binary To ASCII
BTP Batch Transfer Program
BTR Bit Test and Reset
BTS Base Transceiver Station + Bit Test and Set
BU Branch Unit
BUBL Bulletin Board for Libraries [Janet]
BUF Buffer
BUS Broadcast and Unknown Server
BVH Base Video Handler
BWM Block-Write Mode
B2X Binary To Hexadecimal [REXX]
BYTE Binary Element String
C...|TOP | UP to B | DN to D | BOTTOM |C C Programming Language
.C C source code (file name extension) [C]
CA Certification Authority + Collision Avoidance
CAB Compressed Application Binary [Microsoft]
.CAB Cabinet (file name extension) [Microsoft]
CACLS Command-Line Access Control Lists [Microsoft]
CAD Computer Aided Design
CADD Computer Aided Design and Drafting
CADE Client/server Application Development Environment
CAE Client Application Enabler + Common Applications
Environment + Computer Aided Engineering
CAEN Chemically Assembled Electronic Nanocomputer
CAEX Computer Aided Exploration
CAG Column Address Generator
CAI Computer Aided Instruction
CAIRN Collaborative Advanced Interagency Research Network
CAL Calendar + Client Access License +
Computer Aided Learning
CALS Computer-Aided Acquisition in Logistic Support
CAM Common Access Method + Computer Aided Manufacturing +
Contents Addressable Memory
CAN Cancel + Controller Area Network
CANBUS Conroller Area Network Bus
CAP Carrierless Amplitude and Phase-Modulation +
Central Arbitration Point +
Communication Application Platform +
Competitive Access Provider +
Computer Aided Publishing
.CAP Capture (file name extension)
CAPD Computing To Assist Persons With Disabilities [Johns
Hopkins University]
CAPE Concurrent Art-to-Product Environment
CAPS Capitals (Upper Case Letters) +
Cassette Programming System
CAPTCHA Completely Automatic Public Turing Test To Tell
Computers and Humans Apart
CAR Committed Access Rate [Cisco]
CARL Colorado Alliance of Research Libraries [Internet]
CART Computer-Assisted Radar Tomography
CAS Column Address Select/Strobe +
Communications Application Specification +
Computer Aided Styling
CASE Computer Aided Software Engineering
CASL Crosstalk Application Scripting Language [DCA]
CASS Computer Assisted Search Service
CASSIS Classified and Search Support Information System
CAT Computer Adaptive Test + Computer Aided Testing +
Computer Aided Tomography +
Computer Aided Transcription + Concatenate
.CAT Catalog (file name extension)
CATS Computer Assisted Training System
CAT5E (Cat 5e) Category 5e (cables)
CAT SCAN Computerized Axial Tomography Scan
CATV Community Antenna Television (this was the original
name for what is now known as Cable TV)
CAU Controlled Access Unit
CAV Constant Angular Velocity
CAVE Computer Automatic Virtual Environment
CBC Cipher Block Chaining
CBCR Channel Byte Count Register
CBDS Connectionless Broadband Data Service
CBEMA Computer and Business Equipment
Manufacturers Association
CBGA Ceramic Ball Grid Array
CBI Computer Based Instruction\Instrumentation
CBL Computer Based Learning
.CBL COBOL source code (file name extension)
CBMS Computer-Based Mail System
CBN Community Based Networks
CBR Case Based Reasoning + Constant Bit Rate
CBT Computer Based Training
CBW Convert Byte to Word
CBX Computer-Controlled Branch Exchange
CC Cluster Controller
CC: Carbon Copy
CCD Charged-Coupled Device
CCFT Cold Cathode Fluorescent Tube
CCI Common Client Interface + Copy Control Information
CCIE Cisco Certified Internetwork Expert [Cisco]
CCITT Comite Consultatif International Telegraphique et
Telephonique/ Consultative Committee for International
Telegraph and Telephone
CCL Connection/Cursor Control Language
CCM Corba Component Mode
CCNA Cisco Certified Network Associate
CCNP Cisco Certified Network Professional
CCP Certified Computing Professional +
Console Command Processor
CC/PP Composite Capabilities/Preference Profile
CCS Common Command Set + Common Communications Services +
Common Communications Support +
Continuous Composite Servo + Cryptographic Checksum
.CCS Color Calibration System (file name extension)
CCSIS Coded Character Set ID
CCSD Cellular Circuit-Switched Data
CCTLD Country Code Top-Level Domain
CD Carrier Detect + Change Directory +
Collision Detection + Color Display + Compact Disk
C/D Control Data
C2D Character To Decimal [REXX]
CDA Compound Document Architecture [DEC]
.CDA CD Audio-Track (file name extension)
CDBT Compact Disk-Based Training
CDC Connected Device Configuration +
Control Data Corporation
CD_CHRDY Card Channel Ready [IBM]
CD-DA Compact Disk - Digital Audio
CDDI Copper Distributed Data Interface
CDE Common Desktop Environment + Complex Data Entry
CD-E Compact Disk - Erasable
CDF Channel Definition Format
.CDF Comma Delimited Format (file name extension)
CDFS Compact Disc File System [Microsoft]
CD+G Compact Disk plus Graphics
CD-I Compact Disk - Interactive
CDIA Certified Document Imaging Architect
CDL Computer Design Language
CDMA Code Division Multiple Access
CDMF Commercial Data Masking Facility [IBM]
CD-MO Compact Disk - Magneto Optical
CDO Collaboration Data Objects [Microsoft]
CDOS Concurrent Disk Operating System
CDP * Certificate In Data Processing (First certification
for Computer Professionals)
CDPD Cellular Digital Packet Data
CDR Call Detail Record + Call Detail Recording +
Common Data Representation
.CDR CorelDRAW (file name extension) [Corel]
CD-R Compact Disk - Recordable
CD-RAM Cached RAM
CD-RDX Compact Disk - Read Only Memory Data Exchange Standard
CDRL Contract Data Requirements List
CD-ROM Compact Disk - Read Only Memory
CD-ROM-XA CD-ROM Extended Architecture
CD-RTOS Compact Disk - Real Time Operating System
CD-RW Compact Disk - Rewritable
CDS Current Directory Structure
CDSA Common Data Security Architecture
CDSL (See DSL)
.CDT Corel Draw Template (file name extension)
CD-V Compact Disk - Video
CD-WO Compact Disk - Write Once
.CDX Compound Index (file name extension) [Fox Pro]
CD-XA Compact Disk - Extended Architecture
CE Cache Enable + Chip Enable + Collision Elimination +
Consumer Elecronics + Convert Enable
CEB Conditional End Bracket
CEC Certified E-Commerce Consultant
CEG Continuous Edge Graphics
CEI Conducted Electromagnetic Interference
CELP Card Edge Low Profile (socket) [Intel]
CEMS Constituent Electronic Mail System
CEOP Conditional End Of Page
CER Canonical Encoding Rules
CERN The European Particle Physics Laboratory (initials
originally from Conseil Europeen pour la Recherche
Nucleaire)
CERT Computer Emergency Response Team
CFB Cipher Feedback + Configurable Function Block
.CFG Configuration (file name extension)
CFM Code Fragment Manager [Macintosh] +
Cubic Feet Per Minute
CFML ColdFusion Markup Language
CFP Call For Proposal
CFR Computerized Facial Recognition
CFS Caching/Common File System
CFV Call For Votes [Bitnet]
CG Control Gate
CGA Color Graphics Adapter
CGE Common Graphics Environment
CGI Computer Generated Images + Computer Graphics Interface
CGI-BIN Common Gateway Interface - Binary
.CGM Computer Graphics Metafile (file name extension) +
Graph (file name extension) [Lotus 1-2-3] [LDC]
CGMS Copy Generation Management System
CGS Continuous-Grain Silicon
CHAP Challenge-Handshake Authentication Protocol
CHAR Character
CHAT Conversational Hypertext Access Technology [Internet]
CHCK Channel Check
CHCP Change Code Page
CHDIR Change Directory
CHFN Change Finger [Unix]
CHGRP Change Group
CHIPS Clearinghouse Interbank Payments System
.CHK CHKDSK (file name extension)
CHKDSK Check Disk
CHMOD Change Mode
CHOWN Change Owner
CHP Chapter
CHR Character
CHRP Common Hardware Reference Platform
CHS Cylinder Head Sector
CHTML Compact/Compressed HTML
CI Component Interface
CIA Current Instruction Address
CIAC Computer Incident Advisory Capability
CICS/VS Customer Information Control System/
Virtual Storage [IBM]
CID Charge-Injection Device +
Configuration/Installation/Distribution
CIDR Classless Inter-Domain Routing
CIF Common Interchange/Intermediate Format +
Crystallographic Information File +
Customer Information Feed
CIFS Common Internet File System
CIL Common Intermediate Language [ECMA]
CIM Common Information Model +
CompuServe Information Manager +
Computer Integrated Manufacturing
CIO Chief Information Officer
CIOCS Communication Input/Output Control System
CIP Command Interface Port + Common Indexing Protocol
CIR Committed Information Rate
CIRC Circular Reference +
Cross-Interleaved Reed-Solomon Code
CIS Card Information Structure + Client Information System +
CompuServe Information Service +
Computer Information Systems + Contact Image Sensor +
Customer Information System
CISC Complex Instruction Set Computing
CIT Computer-Integrated Telephony
CIVR Computer and Interactive Voice Response
CIW Certified Internet Webmaster
CIX Commercial Internet Exchange +
Compulink Information Exchange
CJLI Command Job Language Interpreter
CKD Count Key Data (device)
CLAR Channel Local Address Register
CLASS Client Access to Systems and Services +
Cooperative Library Agency for Systems and Services +
Custom Local-Area Signaling Services
CLC Clear Carry Flag
CLD Clear Direction Flag
CLDC Connected Limited Device Configuration
CLEC Competitive Local Exchange Carrier
CLI Call-Level Interface + Clear Interrupt Flag +
Client Library Interface + Command Line Interface +
Common Language Infrastructure/Interface
CLIB C Library
CLID Calling Line Identification
CLIST Command List
CLK Clock
CLNP Connectionless Network Protocol
CLOS Common Lisp Object System
CLP Cell Loss Priority + Constraint Logic Programming
.CLP Clipboard (file name extension) [Microsoft]
CLR Common Language Runtime [Microsoft]
CLS Clear Screen + Common Language Support
CLSID Class Identifier
CLTP Connectionless Transport Protocol
CLTS Clear Task Switch Flag
CLTV Constant Linear Time Velocity
CLUI Command Line User Interface
CLUT Color Look-Up Table
CLV Constant Linear Velocity
CM Centimeter + Control Mark + Corrective Maintenance
CMA Concert Multi-thread Architecture
CMAK Connection Manager Administration Kit [Microsoft]
CMC Common Mail Calls + Common Messaging Calls +
Communication Management Configuration +
Complement Carry Flag +
Computer-Mediated Communication [Internet]
CMD Circuit Mode Data
.CMD Command (file name extension)
CMF Creative Music Format
CNIDR Clearinghouse for Network Information and
Discovery and Retrieval [Internet]
CMIP Common Management Information Protocol
CMIS Common Management Information Services/System
CML Chemical Markup Language + Conceptual Modelling Language +
Computer Managed Learning + Current Mode Logic
CMM Capability Maturity Model
CMMS Computerized Maintenance Management Software
CMMU Cache/Memory Management Unit [Motorola]
CMOS Coats-Mellon Operational Specification +
Complementary Metal-Oxide Semiconductor
CMOV Conditional Move
CMP Compare + Computer
CMPS Compare Word String
CMS Call Management Server + Code Management System +
Compiler Monitor System + Conversation Monitor System
CMTS Cable Modem Termination System
CMVC Configuration Management Version Control [IBM]
CMW Compartmented Mode Workstation
CMY Cyan-Magenta-Yellow (color model)
CMYK Cyan-Magenta-Yellow-Black (color model)
CNA Certified NetWare/Network Administrator
CNAPS Co-Processing Node Architecture for Parallel Systems
CNC Computerized Numerical Control
CNE Certified NetWare Engineer
.CNF Configuration (file name extension)
CNG Calling (tone)
CNI Certified Novell Instructor [Novell]
CNIDR Clearinghouse for Networked Information and
Discovery and Retrieval [Internet]
CNN Composite Network Node
CNR Carrier to Noise Ratio + Communication Network Riser
CNSS Core Nodal Switching Subsystem [Internet]
CNT Carbon Nanotube
.CNT Contents (file name extension)
CNV Conventional (pertaining to Memory)
CNVT Convert
CNX Certified Network Expert
CO Central Office + Command Output + Convert Out
COAST Card On A Stick (module)
COAX Coaxial Cable
COB Chip-On-Board
.COB COBOL source code (file name extension)
COBOL Common Business-oriented Language (See HLL)
.COD Code List (file name extension)
CODASYL * Conference on Data System Languages (Group that
designed COBOL)
CODE Client-Server Open Development Environment
CODEC Coder/Decoder + Compression/Decompression
COE Common Operating Environment
COEM Commercial Original Equipment Manufacturer
COFF Common Object File Format [Unix]
COGO Coordinate Geometry (Programming Language)
COL Collision + Computer Oriented Language
COLD Computer Output to Laser Disk
COLL Collision
COM Component Object Model [Microsoft] +
Computer Output Microfilm
.COM Command (file name extension) +
Commercial Business (Domain Name) [Internet]
COM1 First serial Port (asynchronous port)
COM2 Second serial Port
COM3 Third serial Port
COM4 Fourth serial Port
COMDEX Computer Dealers Exposition
COMET Cornell Macintosh Terminal Emulator
COMM Communications
COMMAT In Morse Code (.--.-.)(dot dash dash dot dash dot),
name of the sign to denote the Commercial At symbol "@".
(Adopted by the ITU in December 2003)
COMP Compare
COMP. Computers [USENET Newsgroup Category]
COMSAT Communications Satellite Corporation
CON Console (includes Keyboard and Screen)
COND Condition
CONFIG Configuration
CONS Connection-Oriented Network Service
CONTONE Continuous Tone
.COOP Cooperatives-Business (Domain Name) [Internet]
COPICS Communications Oriented Production Information
and Control System [IBM]
COR Common Object Runtime
CORBA Common Object Request Broker Architecture
COREN Corporation for Research and Enterprise Network
COS Compatible Operating System +
Customer Order Specification [Kodak/Fuji]
COSE Combined Office Standard Environment +
Common Open Software/Systems Environment
COSMIC Computer Software Management and Information
Center [NASA]
COSMOS Computer System for Mainframe Operations
COSS Common Object Services Specification
COTS Commercial Off-The-Shelf (software)
CP Copy Protected
CPA Certified Public Accountant + Cost Per Action
CPAN Comprehensive Perl Archive Network
CPC Constant Point Calculation + Cost Per Click
CPCS Check Processing Control System [IBM]
CPE Central Processing Element +
Customer Premises Equipment +
Customer Provided Equipment
.CPE Cover Page (file name extension)
CPFR Collaborative Planning, Forecasting and Replenishment
CPG Clock Pulse Generator
CPI Characters Per Inch + Clock Per Instruction +
Common Programming Interface [IBM]
.CPI Code Page Information (file name extension) [MS-DOS]
CPI-C Common Programming Interface for Communications [IBM]
CPIO Copy In and Out [Unix]
CPL Current Privilege Level
.CPL Control Panel (file name extension)
CPLD Complex Programmable Logic Device
CPM Critical Path Method + Cryptography Provider Manager
CP/M Control Program for Microcomputers [Digital Research]
CPO Chief Privacy Officer
CPRM Content Protection for Recordable Media
CPS Certification Practice Statement +
Characters Per Second + Cycles Per Second
CPT Command Pass Through
CPU Central Processing Unit
CPW Commercial Processing Workload [IBM]
CR Carriage Return
CRAM Challenge-Response Authentication Mechanism +
Cyberspatial Reality Advancement Movement
CRAYON Create Your Own Newspaper
CRC Cyclic Redundancy Check
.CRD Cardfile (file name extension) +
Chord (music file name extension)
CREN Computer Research Education Network +
Corporation for Research and Education Networking
CRF Cable Retransmission Facility + Cross Reference File
CRI Color Reproduction Indices
CRISP C Reduced Instruction Set Processor [AT&T Bell Labs]
CRL Certificate Revocation List
CR/LF Carriage Return/Line Feed
CRM Customer Relationship Management
CROM Control Read Only Memory
CRT Cathode Ray Tube
CRTC CRT Controller
CRUD Create, Retrieve, Update, Delete
CS Chip Select + Clear to Send + Code Segment
C/S Client/Server
CSA Calendaring and Scheduling API [IBM]
CSAR Channel System Address Register
CSCW Computer Supported Cooperative Work
CSD Circuit-Switched Data +
Computer Services Department +
Corrective Service Diskette [IBM]
CSDS Circuit Switched Data Service
CSE Certified System Engineer
CSFI Communication Subsystem For Interconnection
CSG Constructive Solid Geometry +
Consulting Services Group [Lotus]
CSI Code Sequence Identification +
Command Sequence Introducer +
CompuServe Incorporated
CSID Called Subscriber Identification
CSL Computer Sensitive Language
CSLIP Compressed Serial Line Interface Protocol [Internet]
CSM Code Set Map (file) + Communications Services Manager +
Control Strip Module [Macintosh]
CSMA/CA Carrier Sense Multiple Access/with Collision Avoidance
CSMA/CD Carrier Sense Multiple Access/with Collision Detection
CSMS Customer Support Management System
CSN Card-Select Number
CSNET Computer Science Network
CSO Central Services Organization
CSP Certified Systems Professional +
Chip-Scale Packaging +
Commercial Service Provider +
Commercial Subroutine Package +
CompuCom Speed Protocol [CompuCom] +
Communicating Sequential Processes +
Cross System Product [IBM]
CSPDN Circuit Switched Public Data Network
CSRAM Custom Static RAM
CSS * Continuous System Simulator (Language)
CSS Cascading Style Sheet [Microsoft] +
Contact Start-Stop + Content Scrambling System
CSSM Client-Server Systems Management [IBM]
CS/SS Card Service/Socket Service
CSTA Computer-Supported Telephony Applications
CSU Channel Service/Switching Unit
CSV Circuit-Switched Voice +
Comma-Separated Value/Variable +
Common Services Verbs (interface) [Microsoft]
C2T Cable Changing Technology
C&T Chips and Technologies
CTB Cipher Type Byte
CTC Channel To Channel + Counter/Timer Chip
CTCP Client-To-Client Protocol
CTI Computer-Telephony Integration
CTL Complex Text Layout
CTOS Cassette Tape Operating System +
Computerized Tomography Operating System +
Convergent Technologies Operating System
CTPA Coax-to-Twisted-Pair Adapter
CTRCO * Calculating,Tabulating,Recording Company (The name of
this company was changed to "International Business
Machines" by Thomas J. Watson, Sr.)
CTRL Control
CTS Clear To Send + Computer Telephony Solution [IBM] +
Customer Telephone System
CTSS * Compatible Time Sharing System
CUA Common User Access [IBM]
CUB Cursor Backward
CUD Cursor Down
CUE Custom Updates and Extras (card) [Egghead Software]
CUF Cursor Forward
CUI Character-Oriented User Interface +
Common User Interface [IBM]
CUP Cursor Position
CUPID Completely Universal Processor I/O Design [AST]
.CUR Cursor (file name extension)
CUSIP Committee for Uniform Security Identification
Procedures [U.S. Treasury]
CUT Control Unit Terminal
CUTE Clarkston University Terminal Emulator
CUU Cursor Up
CVE Common Vulnerabilities and Exposures [US-CERT]
CVF Compressed Volume File
CVGA Color Video Graphics Array
CVIA Computer Virus Industry Association
CVS Computer Vision Syndrome + Concurrent Versions System
CVT Convert
CVW CodeView for Windows
CWA Competitive Web Analysis
CWD Convert Word to Double Word +
Change Working Directory [Internet]
CWIS Campus Wide Information Service/System [Internet] +
Community Wide Information Service/System [Internet]
C2X Character To Hexadecimal [REXX]
CXML Commerce Extensible Markup Language
CYL Cylinder
CYMK Cyan-Yellow-Magenta-Black (color model)
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