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There are 51 names in this directory beginning with the letter X.
X

1. 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.

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.

X Pixelmap

An 8-bit, 256 colors, 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-axis

The horizontal axis, representing width, in an x-y coordinate system or three-dimensional coordinate system.

x-height

The height of a lowercase x. The x-height plus the height of the ascender and descender determines the point size.

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 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.

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.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.

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.

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.

x86

A series of microprocessors developed by Intel, used in PCs. See 286, 386, 486, 586, 686.

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 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.

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.

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.

xfr

An abbreviation for “transfer”, used in data communications.

XFree86

The free Linux equivalent to the X Window System.

XGA

Extended Graphics Array. A super VGA card from IBM which can provide up to 1024 x 768 pixels and 65,536 colors in its images (resolutions available depend on the combination of XGA card and monitor).

XGML

Text processing software from Software Exoterica Corporation, Ontario. It supports SGML and uses XTRAN, a language for translation and other operations on text. It is available for IBM mainframes, PC, Mac, UNIX, and other systems.

XLF

Extensible Log Format. A log format based on XML, designed to be extensible and universal.

Xlib

X library: The program interface for the X Window System.

XLink

An XML application that expands the way hyperlinks can be used. XLink makes it possible to target a specific section of a document, and adds other options to make linking easier.

XLL

Extensible Linking Language. Specifications for XML linking and addressing mechanisms. XLL has been subdivided into two components: XLink and XPointer. XLink governs how links may be inserted into XML documents, whether they are simple unidirectional hyperlinks as in HTML or more sophisticated two-way, multidirectional, and typed links. XPointer defines a language to be used with XLink for addressing internal elements of XML documents.

XMIT

Transmit.

XML

Extensible Markup Language. A programming language developed by the World Wide Web Consortium; essentially a simplified version of SGML that allows Web developers to create customized tags that will organize and deliver content with more efficiently. XML is a metalanguage, containing a set of rules for constructing other markup languages. By allowing people to make up their own tags, it expands the amount and kinds of information that can be provided about the data held in documents. Some of the advantages are: search engines will be able to zoom in on one particular meaning of a word; new languages can be employed that will allow musical notation and mathematical and chemical symbols to be used as easily as text; e-commerce will become more practical. The World Wide Web Consortium published XML 1.0 in December 1997 www.w3c.org/XML/). Microsoft is a huge proponent of XML, often claiming it will replace HTML and become the next industry standard.

Xmodem

A file transfer protocol, predecessor to Ymodem and Zmodem.

xmosaic

A version of Mosaic for the X Window System.

XMT

Abbreviation for transmit.

XOR

Exclusive OR. An exclusive OR is true if one of the inputs is true, but not both. “A XOR B” means “A or B, but not both.”

XOR gate

A Boolean logic gate used in computer arithmetic. An XOR gate generates a 0 if both the inputs are 0 or if both the inputs are 1. If one of the inputs is 1 and the other is 0 it generates a 1.

Xp orientation

Orientation of a font along the X axis for printing.

xref

Abbreviation for cross-reference.

XRemote

A serial line protocol for the X Window System.

XRN

A Usenet newsreader program for the X Window System.

XSL

Extensible Style Language. A language used to create stylesheets for XML, similar to CSS (Cascading Style Sheets) that are used for HTML. In XML, content and presentation are separate. XML tags do not indicate how they should be displayed. An XML document has to be formatted before it can be read, and the formatting is usually accomplished with stylesheets. Stylesheets consist of formatting rules for how particular XML tags affect the display of a document on a computer screen or a printed page. In XML, different stylesheets can be applied to the same data to hide or display different parts of a document for different users.

XSLT

Extensible Style Language Transformation. It is the language used by .XML style sheets to transfer one form of an .XML document to another .XML form. This transition is extermely useful in e-commerce and e-business, as it serves as a common denominator across many different platforms and varying .XML document coding.

XT

(Extended Technology). The first IBM PC to have a hard disk. It came out in 1983. It had an Intel 8088 microprocessor, 128KB of RAM, and a 10MB hard drive.

xterm

A terminal emulator for X Windows.

XTRAN

A language for translation, matching, and other operations on text.

XVGA

Extended Video Graphics Array. See also VGA.

XView

A toolkit derived from SunView that provides an Open Look user interface for X applications.

XVT

Extensible Virtual Toolkit. An applications development toolkit from XVT Software, Inc., which makes it possible to develop user interfaces for multiple platforms.

xyzzy

A magic word used in the ADVENT adventure game.

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