X:

XML is a pared-down version of SGML, which is designed especially for Web documents.

The CS Help compiler provides XML style sheets that allows a representation of the help file to be viewed in an XML enabled browser.

Flow control character used to signal to a transmitter that it should suspend data transmission. The character is configurable, with the industry standard being decimal 19.

See also: high water mark  

Flow control character used to signal to a transmitter that it should resume data transmission. The character is configurable, with the industry standard being decimal 17.

See also: low water mark