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*The GNU Mach Reference Manual* documents the architecture, the usage and the
programming of the GNU Mach microkernel.  At the moment, the manual documents
the interface completely, but is not very useful as a tutorial or introduction
into the Mach architecture.

  * [HTML version](http://www.gnu.org/software/hurd/gnumach-doc/index.html)
    for browsing online,
  * [PostScript
    version](http://www.gnu.org/software/hurd/gnumach-doc/mach.ps) [around
    900KiB],
  * [gzipped PostScript
    version](http://www.gnu.org/software/hurd/gnumach-doc/mach.ps.gz)
    [around 300KiB],
  * [PDF version](http://www.gnu.org/software/hurd/gnumach-doc/mach.pdf)
    [around 700KiB].