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LIB$GET_PREV_INVO_CONTEXT

   (Alpha and I64 only.) The Get Previous Invocation Context routine
   gets the previous invocation context of any active procedure.

   A thread can obtain the invocation context of the procedure
   context preceding any other procedure context using the following
   function format.

   Format

     LIB$GET_PREV_INVO_CONTEXT   invo_context

Additional information available:

Returns         Argument