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xdiag or diag or ????

a while ago on ai there was a program called xdiag
or diag which let you draw nice diagrams on a lispm.
does anyone know if this still exists, or if it has
been ported to oz, or if it has a new name, or if 
there is something else to do this?  i am particularly
interested in being able to display parse trees of
sentences, but any pretty graphics utility should
work (it would be nice if it generated press files
7 nicer if these could be spliced into existing
press files......).
thanks, rick