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Notes:
Once you have set up your selection context, pass that context symbol to F$PID() and invoke it in a loop until a null PID string if returned.
By default, F$PID() will return the PIDs of all processes in the system (local to a cluster node).
To locate all processes in the cluster matching the other selection criteria, include an F$CONTEXT invocation specifying an item code of NODENAME, a matching string of “*” and a match criterion of “EQL”.
