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"What about NeWS?"

NeWS is an implementation of the PostScript language and imaging model,
with extensions to handle processes, "canvases" (arbitrarily-shaped
windows), input events, etc. It's part of Sun's X11/NeWS merged server,
which is part of OpenWindows, which is now Sun's standard window system
(and is also part of System V release 4, although not core). In 
OpenWindows 2.0, the PostScript implementation and conformance became a
lot more robust (solid enough for Sun to base their NeWSPrint printer
software on it).

NeWS comes with CPS, which lets you define and call PostScript routines
from C and contact the server, an object-oriented programming extensions
to PostScript (written in PS), a prototype UI toolkit (written in PS), a
page previewer, etc.

The nicest thing about it is writing portable PostScript programs that
create windows and animations when you send them to the server, just as
PostScript programs sent to a printer create attractive pages.

For more info, look to comp.windows.news

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