The APPLID is used to identify the instance of the CICS® Universal Client on server connections and tasks in a CICSplex.
Enter up to 8 characters, or leave this field blank. There is
no restriction on the characters that can be used in APPLID, but to ensure
that the APPLID is valid for use in all scenarios, it is advisable to restrict
the characters used to be in the range A through Z, and 0 through 9. The character
strings entered are converted to uppercase for SNA and TCP/IP connections.
The name must be unique within the CICS server system. The value of blank automatically generates a name that is guaranteed to be unique.