MSGMOD start option

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   .-MSGMOD--=--NO------.   
>>-+--------------------+--------------------------------------><
   '-MSGMOD--=--+-NO--+-'   
                '-YES-'     

Specifies whether VTAM® should identify the issuing VTAM module in a message.

You can change the value of MSGMOD with the MODIFY VTAMOPTS command or the MODIFY MSGMOD command while VTAM is running.
MSGMOD=NO
Specifies that VTAM does not identify the issuing VTAM module in a VTAM message.
MSGMOD=YES
Specifies that VTAM inserts the last five characters of the name of the VTAM module that issued a VTAM message into each VTAM message following the message identifier.
Note: Messages might be truncated if you specify this option.