dOPC Client Toolkit Help file
TdOPCEventSubscription Methods
TdOPCEventSubscription Methods
TdOPCEventSubscription Methods 
callback procedure: we get a new event for OPC AE Server
OnEvent is generated when a new event on the OPC AE server occurred. 
Refresh forces a refresh for all active conditions and inactive, unacknowledged conditions whose event notifications match the filter of the event subscription. 
SelectReturnedAttributes sets the attributes to be returned for each event category in the OnEvent callback. 
SetFilter sets the filtering criteria to be used for the event subscription. 
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