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<p>Before looking at the Linux implementation, first a general Unix
description of threads, processes, process groups and sessions.
+</p><p>
+(See also <a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap11.html">General Terminal Interface</a>)
</p><p>A session contains a number of process groups, and a process group
contains a number of processes, and a process contains a number
of threads.