What should be in a group?

Usually, the definitions within a group have something in common. For example:

For application resources:
For communication resources:
For CORBA resources:

For transient data resources, sample definitions for the CICS-supplied transient data queues (those beginning with the letter “C”) are provided in group DFHDCTG. For these definitions to become available for use at the earliest possible point during CICS initialization, include group DFHDCTG as the first group installed during an initial or cold start.