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Return list of process objects corresponding to live child processes
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Process objects represent activity that is run in a separate process
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Method to be run in sub-process; can be overridden in sub-class
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Terminate process; sends SIGTERM signal or uses TerminateProcess()
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Wait until child process terminates
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Set whether process is a daemon
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Set authorization key of process
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Return exit code of process or `None` if it has yet to stop
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