texinfo
     
        a gnu documentation system that uses a single source file to
        produce both on-line information and printed output.  you can
        read the on-line information, known as an "info file", with
        an info documentation-reading program.  by convention, texinfo
        source file names end with a ".texi" or ".texinfo" extension.
     
        you can write and format texinfo files into info files within
        gnu emacs, and read them using the emacs info reader.  if
        you do not have emacs, you can format texinfo files into info
        files using "makeinfo" and read them using "info".  tex is
        used to typeset texinfo files for printing.
     
        texinfo is available from your nearest gnu archive site.
     
        current version: 3.1, as of 1993-03-23.
     
        1994-10-05
     
     
see also:
gnu info gnu emacs makeinfo tex gnu archive site