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The Automation Object wizard implements a dual interface by default, which means that the Automation object supports both
- Late binding at run time, which is through the IDispatch interface. This is implemented as a dispatch interface, or dispinterface.
- Early binding at compile-time, which is accomplished through directly calling one of the member functions in the object's virtual function table (VTable). This is referred to as a custom interface.
Note: Any interfaces generated by the COM Object wizard that do not descend from IDispatch only support VTable calls.