SLUALMSG start option

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   .-SLUALMSG--=--NOSUPP-------.   
>>-+---------------------------+-------------------------------><
   '-SLUALMSG--=--+-SUPPRESS-+-'   
                  '-NOSUPP---'     

Specifies whether VTAM® is to suppress messages for a session setup failure caused when the SLU is not enabled for a session.

You can change the value of SLUALMSG with the MODIFY VTAMOPTS command while VTAM is running.
SLUALMSG=NOSUPP
Specifies that VTAM does not suppress the session setup failure messages.
SLUALMSG=SUPPRESS
Specifies that VTAM suppresses the session setup failure messages.