Library /sys$common/syshlp/helplib.hlb  —  RTL Routines, LIB$  LIB$GET_PREV_INVO_HANDLE
    (Alpha and I64 only.) The Get Previous Invocation Handle routine
    gets the previous invocation handle of any active procedure.

    A thread can obtain an invocation handle of the procedure context
    preceding that of a specified procedure context by using the
    following function format.

    Format

      LIB$GET_PREV_INVO_HANDLE   invo_handle
Additional Information: explode extract
Returns Argument
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