To determine which CICS® servers ECI and EPI requests can be directed to, user applications can query the CICS Transaction Gateway or CICS Universal Client for a list of CICS systems. The query returns a list of the CICS servers that have been defined within the CICS Transaction Gateway or CICS Universal Client. There is no guarantee that communication links exist between the CICS servers and the CICS Transaction Gateway or CICS Universal Client, or that any of the CICS servers are actually available.