X.25 Standard defining the access protocol for public packet switching networks.
X.509  An international standard from the ITU-TSS (International Telecommunications Union-Telecommunications Standards Sector) that specifies how programs can use digital certificates to "authenticate." In English, that means it sets the rules for how a program can know exactly who sent a message. Browsers and e-mail programs can put this to use.
X-windows A collection of programs for organising and maintaining a GUI in Unix or Linux.
XML Extensible Markup Language (XML) is a specification designed for Web documents to describe data. It lets Web designers create customised tags that enable users to manipulate browser-based data without having the browser having to go back to the server every time it needs to make a change.
XON/XOFF A handshaking method used in asynchronous communications that uses ASCII characters 17 and 19, respectively, to signal to the transmitting unit that it should resume or stop transmission.  The purpose for it to ensure that the receiving location does not receive more data than it can process.


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This page was last updated on Sunday, 14 December 2008