Client Identifier selection rules

When Client Identifiers are used together, conflicts might occur. For example, host name NAME1.HOST1.COM may also be IP address 1.2.3.4. If the following DEFAULTAPPL statements exist, only one of the applications can be chosen. 
DEFAULTAPPL  TSO  NAME1.HOST1.COM
DEFAULTAPPL  CICS 1.2.3.4

If USSTCP and DEFAULTAPPL have the same Client Identifier, DEFAULTAPPL will be used. For detailed information, see Resolving DEFAULTAPPL and USS table conflicts.

Telnet uses a very specific Client Identifier hierarchy when assigning Objects, as shown in The mapping rule search order

Parent topic: Mapping Objects to Client Identifiers