Application call processing

After a thread from the application program to the external subsystem has been created, application calls for external data resources are passed to the Normal Call exit routine supplied in the ESAP.

The language interface bound with the application provides the language interface token (LIT) for the external subsystem when it activates IMS to process calls to the external subsystem. The installation specifies a unique LIT for each external subsystem it defines to IMS. IMS matches the LIT provided by the language interface stub with the LIT specified in the definition to route the call to the external subsystem.