A macro processor is able to scan a F90 code, to extract automatically comments and to convert them into a LATEX document. Joining this possibility with a mark-up language interspersed into the F90 code it is possible to use the source code itself as the source for documentation and Man Pages, in a way analogous to PERL 5.0
PODs. A simplified mark-up language is introduced here. The SGML syntax (i.e. marks with the form ... ) is used to allow future expandability toward XML/SGML interpreters. In order to avoid interfering with the F90 compiler marks are added to comments so that the compiler will skip it.
