COM Interview Question

What is IUnknown?
What methods are provided by IUnknown?
What should QueryInterface functions do if requested object was not found?
How can would you create an instance of the object in COM?
What happens when client calls CoCreateInstance?
What the limitations of CoCreateInstance?
What is aggregation?
What is a moniker ?
What’s the difference between COM and DCOM?
What is ROT and GIT ?
What is VARIANT?
What is __declspec(novtable)? Why would you need this?
What is In-proc?
What is OLE?Give examples of OLE usage.
Is .doc document a compound document?

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