RexxRegisterExitDll - Returns

The RexxRegisterExitDll return values are:

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 0      RXEXIT_OK                  Function completed successfully.
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 10     RXEXIT_DUP                 A duplicate handler name has been
                                   successfully registered.  There is
                                   either an EXE handler with the same
                                   name registered in another process,
                                   or a DLL handler with the same name
                                   registered in another DLL.  (To
                                   address this exit handler you must
                                   specify its library name.)
 ──────────────────────────────────────────────────────────────────────
 1002   RXEXIT_NOEMEM              There is insufficient memory to
                                   complete this request.
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