Call this method to establish a connection with the event source represented by pUnk.
[in] A pointer to the IUnknown interface of the event source object.
A pointer to the IID of the event source object.
Subsequently, events fired from pUnk will be routed to handlers in your class by way of the event sink map.
If your class derives from multiple IDispEventSimpleImpl classes, you will need to disambiguate calls to this method by scoping the call with the particular base class you are interested in.
DispEventAdvise establishes a connection with the event source specified in pdiid.