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X Bitmap
A black and white bitmap graphics format used by UNIX. Its filename extension is .XBM. In some WWW browsers, the white parts of the image appear transparent, taking the colour of the background.

X Pixelmap
An 8-bit, 256 colour, bitmap graphics format used with UNIX and the X Window System.

X protocol
The protocol used by the X Window System for exchanging messages between clients and servers.

X terminal
A terminal which acts as an X server

X Window System
Also called X or X Windows. A popular window system developed at MIT and used on some workstations. It is often used on UNIX systems and can be run with other major operating systems. With X, users can run applications on other computers in the network while viewing the output on their own screens. The X terminal with keyboard, mouse, and monitor is considered the server and the applications, which may run on the same computer or a different computer, are considered the clients.

X Windows
Formally knows as the X Window System; also called X. A popular window system developed at MIT and used on some workstations. It is often used on UNIX systems and can be run with other major operating systems. With X, users can run applications on other computers in the network while viewing the output on their own screens. The X terminal with keyboard, mouse, and monitor is considered the server and the applications, which may run on the same computer or a different computer, are considered the clients.

X-off
Transmitter off. A code that turns off the transmission of data from a computer to a terminal.

X-on or X-ON
Transmitter on. A code that turns on the transmission of data from a computer to a terminal.

x-y-z matrix
A three-dimensional matrix, in which the x axis represents width, the y axis represents height, and the z axis represents depth.

X/Open
An international consortium of computer product vendors whose purpose is to promote the development of portable applications based on UNIX. This group publishes the X/Open Portability Guide

Xapi-J
A standardized XML (Extensible Markup Language) API (Application Programming Interface) in Java.

Xbase
The generic term for database languages similar to dBASE. Some examples are FoxPro and Clipper.

Xeon
A new Pentium II cartridge introduced by Intel in 1998, designed for use with high performance servers. The Xeon, twice as tall as the Pentium II, fits into new connector called Slot Two. Other improvements are new type L2 cache CSRAM chips, which run at full CPU speed; support for clustered servers; new chip sets 82440GX and 82450NX; possibility of caching up to 8 GB RAM; ability to use up to eight Xeons in one server.

Xerox Corporation's Palo Alto Research Centre
(Xerox PARC). The research centre from which came many important innovations in the computer field, such as some elements of the graphical user interface (the mouse, windows, and icons), laser printers, object-oriented languages, bitmap graphics, local area networks, and the personal computer itself. Most of these innovations, though discovered at PARC, were not marketed until other companies became interested in them.

XFDL
Extensible Forms Description Language. An open protocol for creating, filling in, and reading complex business forms and legal contracts on the Internet and intranets. XFDL, based on XML, was developed because HTML is not suitable for representing audit able business forms. Though a form has both questions and answers, a form in HTML can only store the answers that the user entered. Using XFDL, the form’s questions and answers can be stored in a single file that can then be digitally signed.

Compiled by Suhana D Basu
[email protected]

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