Applications running in a started procedure, batch, TSO or other non z/OS UNIX environment can use the HWIEVENT service and provide their own ENF exit that receives control when the application-requested events occur on the target CPC or image.

Applications running in a z/OS UNIX environment do not have normal ENF exit processing capabilities available and cannot readily listen for ENF signals. The Common Event Adapter (CEA) address space allows z/OS UNIX applications to be able to receive such event notifications. BCPii provides several services that use the CEA functionality to deliver these same events to z/OS UNIX callers. See the documentation for the z/OS UNIX-only services of BCPii (HWIBeginEventDelivery — Begin delivery of BCPii event notifications, HWIEndEventDelivery — End delivery of BCPii event notifications, HWIManageEvents — Manage the list of BCPii events, and HWIGetEvent — Retrieve outstanding BCPii event notifications) for details about the services a z/OS UNIX application can use to receive event notification.

The use of the CEA address space by BCPii requires some minor CEA setup before z/OS UNIX-only services of BCPii can work properly.