What is "interpress"

Interpress is a page description language developed at Xerox PARC, based on the Forth programming language and an earlier graphics language called JaM. PARC was unable to commercialize Interpress. Two of its creators, Chuck Geschke and John Warnock, left Xerox, formed Adobe Systems, and produced a similar language called PostScript. Interpress was used in some Xerox printers, and supported in Xerox Ventura Publisher. Interpress was also used as the output format for PARC's InterScript system, which was an editable word processor format for rich text documents.