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Definitions

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An ISO and ITU standard for addressing and transporting e-mail messages. It conforms to layer 7 of the OSI model...
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Webopedia Staff
An ISO and ITU standard that defines how global directories should be structured. X.500 directories are hierarchical with different levels...
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Webopedia Staff
In typography, the height of a lowercase x in a specific font. This is also called the body height, as...
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Webopedia Staff
Xenix is a version of UNIX that runs on PCs. Xenix was developed by Microsoft Corporation and is compatible with...
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Webopedia Staff
Short for extended graphics array, a high-resolution graphics standard introduced by IBM in 1990. XGA was designed to replace the...
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Webopedia Staff
Originally developed in 1977 by Ward Christensen, Xmodem is one of the most popular file-transfer protocols. Although Xmodem is a...
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XMS
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Stands for Extended Memory Specification, a procedure developed jointly by AST Research, Intel Corporation, Lotus Development, and Microsoft Corporation for...
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Webopedia Staff
Known as the exclusive OR operator, a Boolean operatorthat returns a value of TRUE only if just one of its...
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Webopedia Staff
An asynchronous communications protocol designed by Chuck Forsberg that extends Xmodem by increasing the transfer block size and by supporting...
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Webopedia Staff
Zero wait state refers to systems that have no wait states. They allow the microprocessor to run at its maximum...
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ZIP
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(1) A popular data compression format. Files that have been compressed with the ZIP format are called ZIP files and...
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Webopedia Staff
An asynchronous communications protocol that provides faster data transfer rates and better error detection than Xmodem. In particular, Zmodem supports...
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