psfont.dtx is intended as a replacement for psfonts.dtx of psnfss. It uses one file for redefining the all default fonts instead of one file for each font. It also contains all parts of psfonts.dtx which are not covered by this general concept, ie. the pifonts, mathptm and two .fd-files for Adobe Symbol and Adobe Zapf Dingbats. This file is specific to PostScript fonts. The package works with a style file psfont.sty and a configuration file psfont.cfg. altfont.dtx uses the same concepts as psfont.dtx, but is written in a more general way. It can be used with any fonts which are to be used as default fonts. It is more powerful than psfont.dtx, but does not contain anything PostScript specific. It can be used as a replacement for some parts of both psnfss and mfnfss. Both files require LaTeX2e. Sebastian Kirsch