The tool scans a PostScript file, and replaces the embedded Adobe Type 1 fonts with appropriately subsetted versions. The process of scanning the file is done using a PostScript program executing in ghostscript.

The need for the tool has largely disappeared, for (La)TeX users, following the introduction of the partial-downloading capabilities of current versions of dvips.

The author is Basil Malyshev. The package is Copyright © 1994 Basil K. Malyshev.