The JCL support in Mainframe Subsystem Support includes an event manager, which provides support for third-party products such as schedulers.
When an enterprise server is started, it can call a user exit program, which on this first call can register an interest in particular types of events (for example, abends). Then whenever an event of any of the registered types occurs, the event manager will call the user exit program to process it. This user exit program can be a third party tool, such as a scheduler.
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