X.121: The addressing format used by X.25 base networks.
X.25: A connection-oriented network facility.
X.400: An international messaging standard, used in electronic mail systems.
x86-based Computer: A computer using a microprocessor equivalent to an Intel 80386 or higher chip.
XGA: Extended Graphics Adapter. IBM's graphics standard that includes VGA and supports higher resolutions, up to 1024 pixels by 768 lines interlaced.
X-height: A way of measuring type, it's the height of the lower case letter "x" in the particular font.
XModem/CRC: A communications protocol for transmitting binary files that uses a cyclic redundancy check (CRC) to detect any transmission errors. Both computers must be set to transmit and receive 8 data bits per character.
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