O...

• OAB One-to-All Broadcast
• OAD Open Architecture Driver [Bernoulli]
• OAG Official Airline Guide + Online Air Guide
• OAI Open Applications Interface
• OAS One-to-All Scatter
• OBD On Board Diagnostics
• OBEX Object Exchange [Borland]
• OBJ Object
• OC Optical Carrier
• OCE Open Collaborative Environment [Apple]
• OCF Objects Components Framework [Borland]
• OCL Object Constaint Language + Operation Control Language + Operator Control Language
• OCR Optical Character Recognition
• OCS On-Card Sequencer
• OCX OLE Custom Control
• ODA Open Document Architecture
• ODAPI Open Database Application Programming
• Interface [Borland]
• ODBC Object-Oriented Database Connectivity + Open Data Base Connectivity [Microsoft]
• ODBMS Object-Oriented Database Management System (also
• see OODMS)
• ODI Open Datalink Interface [Novell] + Open Device Interconnect [NetWare]
• ODIF Open Document Interchange Format
• ODL Object Definition Language
• ODM Object Data Manager [IBM] + Optimized Distribution Model [Compaq]
• ODMA Open Document Management API
• ODP Open Distributed Processing
• ODS Open Data Services [Microsoft] + Operational Data Store
• ODSI Open Directory Service Interface [Microsoft]
• ODT Open Desktop
• OEM Original Equipment Manufacturer
• OEP Operand Execution Pipeline
• OF Overflow Flag
• OFB Output Feedback (mode)
• OFDM Orthogonal Frequency Division Multiplexing
• OFMT Output Format for Numbers
• OFS Object File System [Microsoft] + Output Field Separator
• OFX Open Financial Exchange
• OH Off Hook
• OHCI Open Host Controller Interface
• OID Object Identifier
• OIDL Object Interface Definition Language
• OIS Office Information System
• OLAP Online Analytical Processing
• OLCP Online Complex Processing
• .OLD Old version (file name extension)
• OLE Object Linking and Embedding [Microsoft]
• OLED Organic Light Emitting Diode
• OLGA Online Guitar Archive
• OLI Optical Line Interface [AT&T]
• OLMC Output Logic Macrocell
• OLSP Online Service Provider
• OLTP Online Transaction Processing
• OM Object Manager
• OMA Object Management Architecture [Microsoft]
• OME Open Messaging Environment (protocol)
• OMF Object Module Format [Microsoft] + Open Media Framework + Open Message Format
• OMG Object Management Group
• OMI Open Messaging Interface [Lotus]
• OML Object Manipulation Language
• OMR Optical Mark Recognition
• ONC Open Network Computing [Sun]
• ONDS Open Network Distribution Services [IBM]
• ONE Open Network Environment [Netscape]
• ONMS Open Network Management System
• ONU Optical Network Unit
• OOAD Object-Oriented Analysis and Design
• OOB Out Of Band
• OODB Object-Oriented Database
• OODMS Object-Oriented Database Management System (also
• see ODBMS)
• OOL Object-Oriented Language
• OOOS Object-Oriented Operating System
• OOPL Object-Oriented Programming Language
• OOPS Object Oriented Programming and Systems
• OOS Object-Oriented Systems + Off-line Operating Simulator
• OOT Object-Oriented Technology
• OOUI Object Oriented User Interface
• OP Operation + Optical + Output
• OPAC Online Public Access Catalog [Internet]
• OPC Open Process Control + Organic/Optical Photoconductor
• OPCODE Operational Code
• OPD Operand
• OPI Open Prepress Interface
• OPM Operations Per Minute
• OPS Open Profiling Standard + Oracle Parallel Server [Oracle]
• OPT Open Protocol Technology
• .OPT Options (file name extension)
• OPUS Octal Program Updating System
• OQL Object Query Language
• ORACLE On-Line Inquiry and Report Generator (UNIX DB program)
• ORB Object Request Broker [Microsoft]
• ORDVAC * Ordnance Variable Automatic Computer
• .ORG Non-Profit Organizations (Domain name) [Internet]
• ORI Online Retrieval Interface
• .ORI Original (file name extension)
• ORL Optical Return Loss
• OROM Optical Read-Only Memory
• ORS Output Record Separator
• OS Operating System
• OS/2 Operating System/2 [IBM]
• OSA Open Scripting/System Architecture
• OSD On Screen Display + Open Software Description/Distribution
• OSE Office Server Extensions [Microsoft]
• OS/E Operating System/Environment
• OSF Open Software Foundation
• OSI Open Systems Interconnection
• OSM Off-Screen Model
• OSP On-Screen Programming + Optical Storage Processor
• OSPF Open Shortest Path First
• OSQL Object Structured Query Language
• OSR2 OEM Service Release 2 [Microsoft]
• OSS Open Source Software
• OT Object Technology
• OTA Operation-Triggered Architecture
• OTDR Optical Time Domain Reflectometer
• OTF Open Token Foundation
• OTI Object Technology International [IBM]
• OTP One-Time Programmable
• OUI Organizational Unique Identifier
• OURS Open Users Recommended Solutions
• .OUT Outlines (file name extension)
• OUTS Output String
• OV Overflow
• OVAL Object-Based Virtual Application Language [Psion]
• .OVL Program Overlay (file name extension)
• .OVR Program Overlay (file name extension)
• OWL Object/Open Windows Library [Borland]