GetNextEvent

Get the next child of this source according to the internal iterator.
Before starting enumeration of events call GetFirstEvent
After adding or removing events you must restart enumeration by calling GetFirstEvent.
If the source is locked by an asyncroneous operation, this method will not return E_FAIL, but wait until the lock is released.

HRESULT GetNextEvent([out, retval]
IEvtCfgSEvent** ppEvent);