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RTL Routines, LIB$, LIB$GET_PREV_INVO_HANDLE
 *Conan The Librarian 

    (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

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