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ComTrace is a tool that will intercept both calls made on your interfaces and calls made to the COM library, and trace these for you. You will see the name of the method call, the parameters passed to the method and the returning HRESULT.

ComTrace will walk the callstack before method invocation and trace the values of the parameters. Before the call returns to the client, ComTrace will once again walk the callstack and hook any interfaces beeing returned to the client (such as [out], [out, retval] parameters).