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X terminal
In computing, an X terminal is a display/input terminal for X Window System client applications. X terminals enjoyed a period of popularity in the early 1990s when they offered a lower total cost of ownership alternative to a full Unix workstation.
An X terminal runs an X server. (In X, the usage of "client" and "server" is from the viewpoint of the programs: the X server supplies a screen, keyboard, mouse and touchscreen to client applications.) This connects to an X display manager (introduced in X11R3) running on a central machine, using XDMCP (X Display Manager Control Protocol, introduced in X11R4).〔.〕
Thin clients have somewhat supplanted X terminals in that they are equipped with added flash memory and software for communication with remote desktop protocols. Due to the existence of free software implementations of multiple protocols, X terminals which do not have this extra flash memory have been made commercially obsolete by more general-purpose thin clients and by low cost PCs running an X server.
==Vendors==
In the early 1990s, several vendors introduced X terminals including Network Computing Devices (NCD), Gipsi, Hewlett Packard (HP), Digital Equipment Corporation (DEC, later absorbed by HP), IBM, Samsung〔.〕 and Tektronix.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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