The Command Subtree Identifier is used to represent a part of a process (or command) tree headed by a particular parent process. The ID used is the Pid of the process that heads the subtree.

Normally a process has a CSID equal to it's own Pid. However, when processes become orphaned they acquire the subtree Id of their original parent and become adopted by their grand-parents by acquiring their grand-parents's Pid as their new parent Pid.

Refer to the following for more detailed information

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