Object application
An application that acts as a server to provide various data objects to be included in a compound document.

OnNow
A design initiative that seeks to create all the components required for a comprehensive, system-wide approach to system and device power control. OnNow is a term for a PC that is always on but appears off and that responds immediately to user or other requests.

Open Datalink Interface (ODI)
A specification defined by Novell and Apple Computer to provide a protocol and API for communicating with network adapter drivers, and to support the use of multiple protocols by a network adapter driver.

Open Group
The Parent company of a number of standards organizations including The Active Group—now managing the core ActiveX technology, X/Open, and OSF.

OpenType
A font specification for Windows 98 that extends the TrueType font standard by adding tables containing information for advanced multilingual typesetting and typographic control.

Option ROM
Optional read-only memory found on PC bus expansion cards. This ROM usually contains additional firmware required to properly boot the peripheral connected to the expansion card, for instance, a hard drive. Also referred to as an expansion ROM.

OSI
Open Systems Interconnection (Reference Model).