Xerox Escape Sequence or XES is a page description language (PDL) developed by Xerox corporation and introduced with their 2700 laser printers in 1982.
XES offers similar capabilities to Hewlett-Packard's Printer Command Language (PCL), which first appeared in 1984.
XES is supported by most Xerox laser printers including the 2700.
[1] XES is sometimes known as UDK, from User Defined Key, the character which introduces the printer command, usually the escape character (ESC).
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