TM resources: VTAM LTERMs

LTERM name uniqueness

IMS enforces name uniqueness for VTAM LTERM names to ensure output security within an IMSplex. When an LTERM becomes active, IMS ensures that the LTERM does not become active on any other IMS and is unavailable to any other user or terminal.

For LU 6.1 sessions, LTERM name uniqueness can be ignored by using the DFSINTX0 user exit routine. See IMS Version 15.5 Exit Routines for more information about this exit routine.

IMS no longer supports BTAM terminals.

LTERM creation and deletion

When an LTERM becomes active during signon or logon, IMS defines it to the RM. If the name is the same as a transaction, APPC descriptor, or MSNAME, or if the LTERM is active on another IMS, the LTERM does not become active. The signon of a dynamic user continues without an LTERM assigned (but if there is only one LTERM, the signon is rejected), and the logon for a static terminal is rejected. IMS also defines LTERMs to RM when recoverable commands affecting significant status are processed.

When an LTERM becomes inactive and there is no significant status data, IMS deletes the LTERM. An LTERM is deleted in three situations:

• During a logoff or signoff
• When a command deleting significant status is processed
• During resource cleanup after an IMS failure and no significant status exists