Library /sys$common/syshlp/helplib.hlb  —  RTL Routines, LIB$  LIB$I64_GET_PREV_INVO_HANDLE
    (I64 only.) The Get Previous Invocation Handle routine gets an
    invocation handle of the procedure context preceding that of a
    specified procedure context.

    Format

      LIB$I64_GET_PREV_INVO_HANDLE  invo_handle_in, invo_handle_out
Additional Information: explode extract
Returns Argument
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