X.25- a packet switching standard by the CCITT.
X.400 - a message handling system standard by the CCITT.
X.500 - a directory services standard by the CCITT.
X rays - very high frequency electromagnetic waves.
X Windows - a window driven interface system that works over networks. The system was developed at MIT, and is quickly becoming the standard windowed interface. Personal computer manufacturers are slowly evolving their windowed operating systems towards X-Windows like standards. This standard only specifies low level details, higher level standards have been developed: Motif, and Openlook.
XFER - transfer.
XMIT - transmit.
xmodem - a popular protocol for transmitting files over text based connections. compression and error checking are included.
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