I was just wondering that I should be proud of the fact that the technology I am working right now has the largest windows API named, CoMarshalInterThreadInterfaceInStream. This is COM API used to marshal the COM interface pointer between different threads to stay compliant with COM threading model.
From my experience till now, I have helped couple of my customers to solve their issues just because of lack of this API knowledge. Very important thing to understand in COM basics.
In one way its not at all an important thing.. but just thinking another way round :-)