VMS Help DCE_RPC, API Runtime Intro, Frequently Used Routine Parameters, status  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   Each routine in the RPC API returns a DCE status code indicating
   whether the routine completed successfully or, if not, why not.
   A return value of rpc_s_ok indicates success.  All other return
   values signify routine failure.  The status codes listed for each
   RPC runtime routine are the most likely, but not necessarily all,
   the status codes that the routine can return.

   The status code argument has a data type of unsigned32.

   To translate a DCE status code to a text message, call the routine
   dce_error_inq_text().

   Note that RPC exceptions are equivalent to RPC status codes.  To
   identify the status code that corresponds to a given exception,
   replace the _x_ string of the exception with the string _s_; for
   example, the exception rpc_x_already_listening is equivalent to
   the status code rpc_s_already_listening.

   For more information about the RPC status codes, see the OSF DCE
   Problem Determination Guide.