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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. | |