Short for Extensible Messaging and Presence Protocol, an open, XML-based protocol for server-to-server near-real-time extensible instant messaging and presence. XMPP is a rival protocol to SIMPLE.
XMPP also is known as the Jabber protocol because Jabber is based on XMPP. Jabber is not, however, the only instant messaging application that relies on XMPP.
Stands for Extended Memory Specification, a procedure developed jointly by AST Research, Intel Corporation, Lotus Development, and Microsoft Corporation for using extended memory and DOS’s high memory area, a 64K block just above 1MB.
- XM Satellite Radio
A U.S.-based satellite radio provider that offers North American-based services. XM and and competing satellite radio provider, Sirius, merged in 2007 to create a single satellite radio network in the United States and Canada. Since the merger, XM Satellite Radio has been operated by Sirius XM Radio.
- XOR operator
Known as the exclusive OR operator, a Boolean operator that returns a value of TRUE only if just one of its operands is TRUE. In contrast, an inclusive OR operator returns a value of TRUE if either or both of its operands are TRUE.
(Pronounced exo-tickle) An open source object-oriented scripting language that is based on OTcl but adds several new concepts. XOTcl was intended to develop language support for the implementation of design patterns, where design patterns can be added or removed at runtime.
(1) See Extreme Programming. (2) See Windows XP.