Because TSO/VTAM uses VTAM® logon facilities, the TSO LOGON command is not supported. You can make this not apparent to terminal users by defining an interpret table to allow logon requests to have the same format as that used by the TSO LOGON command. The following interpret table definition can be used:

INTBL    INTAB
         LOGCHAR APPLID=(APPLICID,TSO),SEQNCE='LOGON'
         LOGCHAR APPLID=(APPLICID,TSO),SEQNCE='logon'
         ENDINTAB
         END