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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 available:

Returns         Argument