Documentation for Until consists of a very brief manual written by Glenn Gribble, in Postscript. The manual is basically untouched from the pre-Unix version of Until, and is in need of updating and HTML conversion. Luckily, the Macintosh-like menu system of Until makes it the easiest of all the Chipmunk tools to learn via exploration.
Postscript generated by the PS menu command creates Postscript that is compatibile with the psfig macros in TeX and LaTex. Incidently, all other Chipmunk tools also create psfig-compatible Postscript.
Postscript generated by the PS-LBL menu command creates two files, a Postscript file and a TeX file that contains all textual parts of the figure. The Until package includes the macro package psmac that can accept these two files, and produce figures where the text in the figures is in the same font as the text in the rest of the document. The directory chipmunk/until/designrules contains an example using these macros in this way.