For additional information about IMPLTYPEFLAGS, see the MSDN Library.
The common language runtime throws an exception when a COM method in native code returns an HRESULT. For more information, see How to: Map HRESULTs and Exceptions.
The interface or dispinterface represents the default for the source or sink.
Sinks receive events through the virtual function table (VTBL).
The member should not be displayed or programmable by users.
This member of a coclass is called rather than implemented.