WWMCCSSee World-Wide Military Command and Control System.
WWWWorld Wide Web. The WWW is made up of all of the computers on the Internet which use HTML-capable software (Netscape, Explorer, etc.) to exchange data.
WWW robotA variety of search engine that automatically moves through Web hyperlinks to compile databases of available URLs (universal resource locators).
WYSIWYGWhat You See Is What You Get Display and software technology which shows on the computer screen exactly what will print.
X WindowsA system developed at MIT that allows applications to be displayed in windows and shared among different workstations and terminals.
X Windows/MotifARC/INFO and ArcView operate in the X Windows/Motif environment on all supported UNIX workstation platforms.
X-bitsUnassigned overhead bits. Transmitters should code these bits as zeros while receivers are required to be capable of ignoring the value contained in these…
X-dimension of recorded spotIn facsimile systems, the effective recorded spot dimension measured in the direction of the recorded line.
X-dimension of scanning spotIn facsimile systems, the distance between the centers of adjacent scanning spots measured in the direction of the scanning line on the object.
X-headerUser-defined, unofficial header field that exists in the message header. X-headers are not specifically mentioned in RFC 2822, but the use of an undefined…
X-ON/X-OFFTransmitter On/Transmitter Off (Telecomm/Computer term).
X-Open ConsortiumAn association of American and European vendors formed in 1984 to promote open systems.
X-Ray Laser (XRL)A laser that generates a beam or beams of x-rays. Also called an "X- raser ."
X-RaysThe part of the electromagnetic spectrum whose radiation has much greater frequencies and smaller wavelengths than those of ultraviolet radiation.
X.-series RecommendationsSets of data telecommunications protocols and interfaces defined by CCITT (now, ITU-T) Recommendations. Note: Some of the more common X.
X.400 ConnectorAn Exchange component that is integrated with the message transfer agent (MTA) and can be configured to connect routing groups within Exchange, or to…
X.400 RecommendationsDefines the standard interfaces of an electronic messaging system. These recommendations specify the structure of a message handling system, message…
X.400 transport stackNetworking software required to support X.400 server-to-server message transport. [Exchange 5.5]
X.500A set of standards defining a distributed directory service, developed by the International Standards Organization (ISO).
X.509 CertificateThe International Organization for Standardization/International Telecommunication Union Standardization Department (ISO/ITU-T) X.
X.509 Public Key CertificateThe public key for a user (or device) and a name for the user (or device), together with some other information, rendered unforgeable by the digital…
X.75 Gateway ServiceA protocol for network interworking which supports communication between adjacent networks and communication thru transit networks.
x86 architecturea computer hardware platform based on the Intel family architecture begun with the 8086 and continuing to the Pentium and later families.
XalanXSLT stylesheet processor. For more information, see http://xml.apache.org/xalan-j/
Xenu Link SleuthPopular free software for checking a site for broken internal or external links and creating a sitemap. See also: Xenu - official site
XercesAdvanced parsing. For more information, see http://xerces.apache.org/xerces-j/.
xerographic recordingRecording enabled by the scanning action of an optical beam on a photoconducting surface on which an electrostatically charged latent image is developed…
XHTMLAn XML look-alike for HTML defined by one of several XHTML DTDs. To use XHTML for everything would of course defeat the purpose of XML, because the idea…
XindiceNative XML database. For more information, see http://xml.apache.org/xindice/.
XML (Extensible Markup Language)A markup language that enables users to tag data in order to delimit it, leaving the interpretation of the data to the applications that read it.
XML Path Language (XPath)XPath is a language for finding information in an XML document. XPath is used to navigate through elements and attributes in an XML document.
XML SchemaThe W3C specification for defining the structure, content, and semantics of XML documents.
XML searchingThe ability to search into XML structures, including hierarchical content structures. Industry standards for XML searching includes XPath and XQuery.
XML-APIsFor more information, see http://www.apache.org.
XML-RPCFor more information, see http://www.apache.org.
XML::DBProvides an XML persistance layer using the postgresql database. For more information, see http://xmldb.sourceforge.net/.
XMLSecFor more information, see http://www.apache.org.
XOFFAn abbreviation for the ASCII transmission-control character meaning "Transmitter off."
XONAn abbreviation for the ASCII transmission-control character meaning "Transmitter on."
XOXAssistant Deputy Chief of Staff for Operations (Office Code).
XPathAn addressing mechanism for identifying the parts of an XML document.
XPath (XML Path Language)A language that uniquely identifies or addresses parts of a source XML document.
XPG3An X/Open software standard for UNIX Operating Systems. IBM provides a cshell variable named PSALLOC to make AIX XPG3-compliant, resulting in adding more…
XPointerThe part of the XLL specification that is concerned with identifying sections of documents so that they can be referenced in links or included in other…
Y-dimension of recorded spotIn facsimile systems, the distance between the centers of adjacent recorded spots on adjacent lines measured perpendicular to the recorded line.
Y-dimension of scanning spotIn facsimile systems, the distance between the centers of adjacent scanning spots on adjacent lines measured perpendicular to the scanning line on the…
yaccYet Another Compiler Compiler. A parser generator without which Perl probably would not have existed. See the file perly.y in the Perl source distribution.
Yagi antennaA linear end-fire antenna, consisting of three or more half-wave elements (one driven, one reflector, and one or more directors).
Yahoo!Internet portal company which was started with the popular Yahoo! Directory. See also: Yahoo.com The History of Yahoo! Yahoo! Netrospective
Yahoo! AnswersFree question asking and answering service which allows Yahoo! to leverage social structures to create a bottoms up network of free content.
Yahoo! DirectoryOne of the original, most popular, and most authoritative web directories, started by David Filo and Jerry Yang in 1994. The Yahoo!
Yahoo! Search MarketingYahoo!'s paid search platform, formerly known as Overture. See also: Yahoo! Search Marketing
Yahoo! Site ExplorerResearch tool which webmasters can use to see what pages Yahoo! has indexed from a website, and what pages link at those pages. See also: Yahoo!
yellow alarmAn indication provided to a source device indicating a signal failure condition at a sink device. [T1.
Yield (or Energy Yield)The total effective energy released in a nuclear (or atomic) explosion. It is usually expressed in terms of the equivalent tonnage of TNT required to…
YouTubeFeature rich amateur video upload and syndication website owned by Google. See also: YouTube.com
ZZulu time; the same as Universal Coordinated Time (UTC), i.e. 18z is the same as 18:00 UTC.
Z TimeAbbreviation for Zulu Time. See Coordinated Universal Time.
z-valueThe value of a surface at a particular x,y location (e.g., elevation). Often referred to as spot values or spot elevations.
Z39.50An ANSI protocol standard for WAN (wide area network) information query and exchange to share library referencing requests via distributed electronic…
ZBTSI (zero-byte time slot interchange)A technique applied to a DS1 frame to ensure pulse density requirements are met, where bits 2 through 193 of each frame are scrambled to minimize the…
ZealNon-commercial directory which was bought by Looksmart for $20 million, then abruptly shut down with little to no warning.
Zeal - Volunteer Built Web DirectoryFirst launched in 1999, Zeal was a volunteer-built web directory which was bought by LookSmart for $20 million in October 2000.
zeroVerb. To replace all blocks on a disk with zeros.