This is GNU Ghostscript 5.50a. Ghostscript is the well-known PostScript interpreter which is available for all common and most esoteric platforms and supports many different printers, some displays, and some other formats. The official ghostscript Web page: http://www.cs.wisc.edu/~ghost/index.html Thomas Merz has written a Ghostscript manual which is available in PDF from this site and also from Thomas Merz's site in Germany. http://www.cs.wisc.edu/~ghost/merz.html On the german site the manual is also available in German language. http://www.muc.de/~tm/free/free.html