If both a default application and a USS table are mapped to the same Client Identifier, Telnet will use the default application to immediately initiate a session. If each is mapped by a different Client Identifier, the Object mapped by the higher priority Client Identifier is used. In all cases, any error messages are sent using the USS table messages. For example, if CICS® and USSTAB1 are both mapped to destination IP address 1.1.1.1, Telnet will initiate a session with CICS and use the USS messages for any session setup errors.
If CICS is mapped to USERID USER1 and USSTAB1 is mapped to client IP address 5.5.5.5, Telnet will initiate a session with CICS and use the USS messages for any session setup errors.
If CICS is mapped to linkname LINK1 and USSTAB1 is mapped to hostname TEST1.IBM.COM, Telnet sends a USSMSG10 logon screen to the user. The USS messages will be used for any session setup errors. The default application mapping of CICS will never be used.