- O-band
- O-R mapping
- OA
- OADG
- OAI
- OAM
- OAM&P
- OASIS
- OAW
- obfuscate
- obfuscator
- OBJ file
- object
- object browser
- object bus
- object code
- object computer
- Object Data Management Group
- object data model
- object database
- Object Database Management Group
- object DBMS
- object language
- Object Linking and Embedding
- Object Management Architecture
- Object Management Group
- object model
- object module
- object orientated
- object oriented
- Object Packager
- object program
- object references
- Object Request Broker
- object signing
- object technology
- object technology references
- object-based
- object-oriented analysis
- object-oriented database
- object-oriented DBMS
- object-oriented design
- object-oriented graphics
- object-oriented interface
- object-oriented operating system
- object-oriented programming
- object-oriented technology
- object-relational database
- object-relational DBMS
- object-relational mapping
- Objective C
- ObjectPro
- objects
- ObjectStore
- ObjectStudio
- ObjectView
- ObjectVision
- ObjectWindows
- ObjectWorks
- obnoxiousware
- Obsydian
- OC
- OC-1
- OC-12
- OC-192
- OC-3
- OC-48
- OC1
- OC12
- OC192
- OC3
- OC48
- OC://WebConnect
- occam
- OCE
- oCERT
- OCF
- Ockamy
- OCR
- OCS
- octal
- octet
- octopus cable
- OCX
- ODAPI
- ODBC
- ODBCDirect
- ODBM
- ODBMS
- ODD
- odd parity
- ODF
- ODFM
- ODI
- Odin
- ODM
- ODMA
- ODMG
- ODS
- ODSI
- ODSL
- ODT
- ODVA
- Oe
- OEB
- OEBPS
- OEL
- OEM
- OEM font
- OEM Service Release 2
- OEMI
- OEO
- Oersted
- OFDM
- OFDMA
- off site
- off-hook
- off-line
- off-load
- off-net
- off-premise extension
- off-the-shelf
- offboard
- Office
- Office 10
- Office 11
- Office 12
- Office 2000
- Office 2003
- Office 2007
- Office 7
- Office 8
- Office 9
- office application
- office application suite
- office automation
- Office document
- Office Live
- Office Open XML
- office scanner
- office suite
- Office Vision
- Office XP
- Office:Mac
- OfficeJet
- offline
- offline advertising
- offline browser
- offline browsing
- offline file
- offline navigator
- offline reader
- offline storage
- offload
- offset
- offset lithography
- offset press
- offset printing
- Ofoto
- OFS
- Ogg Theora
- Ogg Vorbis
- OH
- ohm
- Ohm's Law
- ohnosecond
- OI
- OIC
- OID
- Oil Change
- OIM
- OJI
- OK
- Okamie
- Okidata
- OLAP
- OLAP cube
- OLAP Services
- olay
- OLCP
- old media
- OLE
- OLE automation
- OLE automation client
- OLE automation controller
- OLE automation server
- OLE container
- OLE control
- OLE custom control
- OLE Database
- OLE DB
- OLE server
- OLED
- OLPC
- OLR
- OLTP
- OM-Express
- OM-Transact
- OM1
- OMA
- Omaha
- OME
- OMEGAMON
- OMG
- OMI
- omnidirectional
- OmniKey keyboard
- OmniLink60
- OmniPage
- OMNIS 7
- OMNIS Studio
- OmniTRACS
- OMR
- OMT
- on demand
- on die
- on the fly
- on-demand computing
- on-demand printing
- on-demand routing protocol
- on-demand software
- on-hook
- on-line
- on-net
- On2
- On2Movie
- ONA
- onboard
- ONC
- One Laptop Per Child
- one-chip computer
- one-click buying
- one-foot desktop
- one-off
- one-pass color
- one-pass color laser
- one-pass color printer
- one-way hash function
- one-wire
- OneCare
- OneNote
- ones density
- onion diagram
- onion router
- onion routing
- online
- online advertising
- online app
- online application
- online auction
- online backup
- online community
- online complex processing
- online coupons
- online discussion
- online forum
- online gaming
- online help
- online industry
- online journal
- online marketplace
- online music
- online music database
- online music service
- online music store
- online payment service
- online payments
- online postage
- online service
- online stalker
- online stamps
- online storage
- online storefront
- online transaction processing
- OnNow
- ontology
- ONVIF
- Onyx
- OO
- OO.o
- OOA
- OOAD
- OOB bug
- OOB data
- OOBE
- oobie
- OOD
- OODB
- OODBMS
- OOO
- OOoFf
- OOOS
- OOP
- OOPL
- OOPS
- OORDBMS
- OOSE
- OOT
- OOXML
- OP
- op amp
- op code
- opacity
- Opal
- OPC
- opcode
- open
- open architecture
- Open Blueprint
- open computing
- Open CourseWare
- Open CV
- Open Data-link Interface
- Open Database Connectivity
- Open Desktop
- Open Document
- Open eBook
- open file
- Open Group
- Open Handset Alliance
- Open ID
- open interface
- Open Look
- Open Market
- Open Messaging Environment
- Open Mobile Alliance
- Open Moko
- Open Network Computing
- Open Office
- open pipe
- open port
- Open Pretty Good Privacy
- open proxy server
- open reel
- open relay
- Open Server
- open shop
- Open Social
- Open Software Foundation
- open source
- open source code
- Open Source Definition
- open source hardware
- open source phone
- open source program
- open source software
- open source telephony
- open source Unix
- open sourced
- open sourced software
- open standard
- open standards
- open storage
- open system
- Open System Interconnection
- open systems
- Open Transport
- Open With
- Open XML
- OpenAir
- OpenAL
- OpenBSD
- OpenCL
- OpenCourseWare
- OpenDDS
- OpenDoc
- OpenDoc parts
- OpenDocument
- OpenEdge
- OpenGL
- OpenI18N
- OpenID
- OpenJDK
- OpenLDI
- OpenMail
- OpenMG
- OpenMoko
- OpenNT
- OpenOffice
- OpenOffice.org
- OpenPGP
- OpenPIC
- OpenReader
- OpenROAD
- OpenSocial
- OpenSPARC
- OpenStep
- OpenType
- OpenURL
- OpenView
- OpenVME
- OpenVMS
- OpenVZ
- Openwave
- Openwave Mobile Access Gateway
- Openwave Mobile Browser
- OpenWindows
- OpenXML
- Opera
- operand
- operating system
- operating system fingerprinting
- operating system-level virtualization
- operation code
- operational amplifier
- operational data store
- operations
- operations manager
- operations research
- operator
- operator interface
- operator overloading
- operator services
- OPEX
- OPF
- OPI
- OPLC
- OPM
- OPML
- OPROM
- OPS
- OPS/OCF
- OPSEC
- Opsware
- opt-in
- opt-in e-mail
- opt-out
- Opteron
- Opti-Jack
- optical amplifier
- optical bands
- optical channel
- optical character recognition
- optical computer
- optical cross-connect
- optical disc
- optical disc library
- optical disk
- optical disk library
- optical drive
- optical fiber
- optical fibre
- optical isolator
- optical jukebox
- optical library
- optical media
- optical mouse
- optical networking
- optical reader
- optical recognition
- optical resolution
- optical scanner
- optical storage
- optical storage library
- Optical Storage Technology Association
- optical switch
- optical wireless
- optical zoom
- optical zoom range
- optically assisted recording
- optimizer
- optimizing compiler
- option ROM
- options
- options menu
- optoelectronic
- optoelectronics
- optoisolator
- Opturon
- OPX
- OQL
- OR
- OR mapping
- Oracle
- Oracle 10g
- Oracle 11g
- Oracle 11i
- Oracle Browser
- Oracle Collaboration Suite
- Oracle Content Management SDK
- Oracle Data Query
- Oracle database
- Oracle Developer Suite
- Oracle Documents
- Oracle E-Business Suite
- Oracle Express Server
- Oracle Files
- Oracle Files Online
- Oracle Forms
- Oracle Internet File System
- Oracle listener
- Oracle Media Server
- Oracle Parallel Server
- Oracle Process Manufacturing
- Oracle Rdb
- Oracle Reports
- Oracle Universal Server
- Oracle11i
- Oracle8
- Oracle8i
- Oracle9i
- Oracle9i Developer Suite
- Orange Book
- orange button
- orange RSS icon
- orange tags
- orange XML icon
- ORB
- ORB disk
- ORB gateway
- Orbix
- ORDBMS
- order
- order form
- order of magnitude
- ordering upgrades
- ordinal number
- org
- organic
- organic chemistry
- organic compound
- organic LED
- organic listing
- organic results
- organic search
- organic search results
- organic semiconductor
- organizer
- orientation
- Origami
- origin server
- original design manufacturer
- original equipment manufacturer
- Orkut
- ORM
- OROM
- orphan
- orthogonal
- orthophotograph
- OS
- OS 10
- OS hardening
- OS virtualization
- OS X
- OS-9
- OS/2
- OS/2 for Windows
- OS/2 PM
- OS/2 Warp
- OS/2 Warp Connect
- OS/360
- OS/390
- OS/400
- OS/8
- OS/9000
- Osborne I
- OSCAR
- oscillate
- oscillator
- oscilloscope
- OSCOM
- OSD
- OSDL
- OSF
- OSF/Motif
- OSI
- OSI model
- OSI stack
- OSMINE
- OSP
- OSPF
- OSR2
- OSS
- OSTA
- OSU
- OSX
- OSx86
- OT
- OTA
- OTDR
- OTG
- OTOH
- OTP
- OTPROM
- OUI
- OUM
- out of box
- out of memory
- out of the box
- out-of-band
- out-of-band data
- out-of-process server
- outboard
- outbound link
- outbox
- outdent
- outer join
- outline font
- outline processor
- Outlook
- output
- output area
- output bound
- output device
- outside plant
- outside the box
- outsourcing
- overclock
- overclocked
- overclocking
- OverDrive CPU
- overflow error
- overflow server
- overhead
- overlay
- overlay card
- overlay network
- overlinking
- overload
- overload server
- overloading
- oversampling
- overscan
- overstrike
- oversubscribed
- Overture
- overwrite
- oVirt
- Ovonic
- Ovonics
- Ovonyx Unified Memory
- OWA
- OWASP
- OWL
- ownership tag
- OXC
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