There are several ways to remove a region from a generic resource:
When a TOR is dynamically removed from a generic resource, any terminals which are logged on are gradually redirected to the remaining generic resource members, as they log off and back on again.
To re-register CICS with the generic resource, you must close and reopen the VTAM ACB.
For details of the SET VTAM DEREGISTERED command, see the CICS System Programming Reference and the CICS Supplied Transactions manuals.
If you remove a region from a generic resource: