Source : Free On-Line Dictionary of Computing

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)