/sys$common/syshlp/HELPLIB.HLB  —  RTL Routines, LIB$  LIB$GET_PREV_INVO_CONTEXT
    (Alpha and I64 only.) The Get Previous Invocation Context routine
    gets the previous invocation context of any active procedure.

    A thread can obtain the invocation context of the procedure
    context preceding any other procedure context using the following
    function format.

    Format

      LIB$GET_PREV_INVO_CONTEXT   invo_context
Additional Information: explode extract
Returns Argument
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