VMS Help  —  RTL Routines, LIB$  LIB$GET_INVO_HANDLE
    (Alpha and I64 only.) The Get Invocation Handle routine gets an
    invocation handle of any active procedure.

    A thread can obtain an invocation handle corresponding to any
    invocation context block by using the following function format.

    Format

      LIB$GET_INVO_HANDLE  invo_context
Additional Information: explode extract
Returns Argument
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