Interpress

Interpress is a page description language developed at Xerox PARC, based on the FORTH programming language. As with many PARC projects, Interpress was not commercialized at its time of creation, and its primary effect on the world was to cause its creators to get fed up, form their own company, and publish their own version. The company in this case was Adobe Systems, and their version is known as PostScript. Interpress was apparently used in some Xerox printers, but it is not clear whether or not it saw any real use.