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The IO interface for alarms & events only supports callbacks and the client shall implement callback.
The event notifications sent over the callback are of three different formats corresponding to the three main categories (simple
event, condition event, and tracking event). All three event formats have the common part Event. The tracking event has additional
information on the operator and the condition event has additional information on the source condition causing the notification.
In OPC the IO interface is implemented by the interface IOPCEventSink
Figure 5-21 DAIS alarms and events IO IDL in UML