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X
X is a shorter name for the X Window System. X originated in the early 1980s as the result of a research collaboration between Stanford University and MIT (aided by IBM) to develop a cross-platform windowing system.

X (compact disk access time)
X is a base multiplier in a CD and DVD technology which, tells the time it took to read data from the CD in its original version, which is 150kb per second. As successively faster CDs arrive, the convention of indicating the read time in terms of the original speed is adopted. Therefore, a 2X CD had a read access time of 300 KB.

X server
A server of connections to X terminal in a distributed network that uses the X Window System. From the terminal user's point-of-view, the X server may seem like a server of applications in multiple windows. Actually, the applications in the remote computer with the X server are making client requests for the services of a windows manager that runs in each terminal. X servers (as part of the X Window System) typically are installed in a UNIX-based operating system in a mainframe, minicomputer, or workstation.

X terminal
An X terminal is typically a disk less terminal especially designed to provide a low-cost user interface for applications that run in a network X server as part of a distributed X Window System. Typically, X terminals are connected to a server running a UNIX-based operating system in a mainframe, minicomputer, or workstation.

X Window System
The X Window System (sometimes referred to as "X" or as "XWindows") is an open, cross-platform, client/server system for managing a window graphical user interface in a distributed network. In general, such systems are known as windowing system. Remote computers contain applications that make client requests for display management services in each PC or workstation. X Window is primarily used in networks of interconnected mainframe, minicomputer, and workstation. It is also used on the X terminal, which is essentially a workstation with display management capabilities but without its own applications.

X-Box
X-Box is a game console being developed by Microsoft that is intended to provide players with a more realistic and immediate interactive experience than current consoles and to gain Microsoft a leadership position in the game console market. The X-Box includes a 600 MHz Intel processor, a custom-designed graphics processor referred to as the X-Chip, 64 megabyte of memory, and a built-in digital versatile disk movie player.

X.25
The X.25 protocol, adopted as a standard by the Consultative Committee for International Telegraph and Telephone (CCITT), is a commonly-used network protocol. The X.25 protocol allows computers on different public networks (such as CompuServe, Tymnet, or a TCP/IP network) to communicate through an intermediary computer at the network layer level. X.25's protocols correspond closely to the data-link and physical-layer protocols defined in the Open Systems Interconnection (OSI) communication model.

X.400
X.400 is the messaging (notably e-mail) standard specified by the ITU-TS (International Telecommunications Union - Telecommunication Standard Sector). It's an alternative to the more prevalent e-mail protocol, Simple Mail Transfer Protocol. X.400 is common in Europe and Canada. It's actually a set of standards, each in the 400-number range.

X.500
Directory Service is a standard way to develop an electronic directory of people in an organisation so that it can be part of a global directory available to anyone in the world with Internet access. Such a directory is sometimes called a global White Pages directory. The idea is to be able to look up people in a user-friendly way by name, department, or organization.

x2
x2 is a technology from US Robotics (now 3Com) for the downstream transmission of data over ordinary phone lines at 56 Kbps (thousands of bits per second). The 56 Kbps speed is achieved in the downstream direction only (to your home or business). Upstream speed is at the regular maximum speed of 33.6 Kbps. (The actual achieved downstream speed is reported by users to be about 53 Kbps.) x2 provided input to and has been replaced by the V.90 ITU-TS standard.

x86
x86 is a generic name for the series of Intel microprocessor families that began with the 80286 microprocessor. This series has been the provider of computing for personal computers since the 80286 was introduced in 1982. x86 microprocessors include the 386DX/SX/SL family, the 486DX/SX//DX2/SL/DX4 family, and the Pentium 3 family. The x86 line replaced Intel's previous series, the 8086/8088. Adopted by IBM for its first PCs, the 8086/8088 and the continuing x86 series have made Intel the predominant force in microprocessor design and manufacture.

Compiled by Suhana D Basu
[email protected]

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