grogers@uiucdcsm.cs.uiuc.edu (05/16/88)
The "di" in ditroff is for device independence. However, it is the output file that is device independent (all ascii). The data in the output file is device dependent since the position of each character depends on the resolution of the printer and positions are specified in pixels. If ditroff positions were in points rather than pixels then it would more device independent.