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An ITU-T standard that defines communication between DTE and DCE network devices. X.25 uses a reliable Data Link layer protocol called LAPB. X.25 also uses PLP at the Network layer. X.25 has mostly been replaced by Frame Relay.
A windowing environment developed at MIT for Unix workstations. Often referred to simply as X.
X Window is an open and nonproprietary bit-mapped graphics system, designed to be independent of both the display hardware and the underlying operating system. It is supported by all the major workstation vendors.
X Window implements a client/server environment, but with the sense of the terms reversed from today’s common usage.
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