| X |
Formally, the X Window System; also nicknamed 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. 2. The CCITT documents that define communication network standards; for example, X.400 - the Message Handling System, and X.500 - Directory Services.
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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 color of the background.
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| X Pixelmap |
An 8-bit, 256 colors, bitmap graphics format used with UNIX and the X Window System.
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| X protocol |
The protocol used by the X Window System for exchanging messages between clients and servers.
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| X terminal |
A terminal which acts as an X server.
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| 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.
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| 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.
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| x-axis |
The horizontal axis, representing width, in an x-y coordinate system or three-dimensional coordinate system.
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| x-height |
The height of a lowercase x. The x-height plus the height of the ascender and descender determines the point size.
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| X-off |
Transmitter off. A code that turns off the transmission of data from a computer to a terminal.
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| X-on or X-ON |
Transmitter on. A code that turns on the transmission of data from a computer to a terminal.
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| x-y matrix |
A two-dimensional matrix, in which the x axis is the horizontal row, and the y axis is the vertical row. Examples are mathematical tables and two-dimensional graphic figures.
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| 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.
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| X.25 |
A standard protocol for packet-switched data networks, published by the International Telecommunications Union, Telecommunications Sector (ITU-TS). The standard specifies the interfaces between data terminal equipment and the packet-switched network, and how data is assembled into packets. An alternative protocol for packet-switched networks is the newer frame relay standard.
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| X.500 |
A set of ITU-T standards for online directory services, also called a directory information base (DIB) or white pages. X.500 provides a hierarchical structure and some security features like selective access to certain attributes of a listing.
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| 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.
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| x86 |
A series of microprocessors developed by Intel, used in PCs. See 286, 386, 486, 586, 686.
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| Xapi-J |
A standardized XML (Extensible Markup Language) API (Application Programming Interface) in Java.
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| Xbase |
The generic term for database languages similar to dBASE. Some examples are FoxPro and Clipper.
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| 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.
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| Xerox Corporation's Palo Alto Resea |
(Xerox PARC). The research center 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 langauges, 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.
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| Xerox PARC |
Xerox Corporation's Palo Alto Research Center. The research center from which came many important innovations in the computer field, such as some elements of the graphical user interface, laser printers, object-oriented langauges, 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.
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| 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 auditable 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.
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| xfr |
An abbreviation for "transfer", used in data communications.
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| XFree86 |
The free Linux equivalent to the X Window System.
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