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 <A HREF="/software/hurd/hacking-guide/hhg.texi">Texinfo source [60kB]</A>.
 </UL>
 
+<li>
+<a href="http://hurdextras.nongnu.org/ipc_guide/">The <em>Unofficial GNU Mach
+IPC beginner's guide</em></a>, an easy introduction to Inter Process
+Comunication in the Mach microkernel by Manuel Pavón Valderrama.
+
 <LI>
 <A HREF="auth.html">The Authentication Server</A>, the transcript of a talk about the details of
 the authentication mechanisms in the Hurd by Wolfgang J&auml;hrling.