We can implement a dual interface using the IDispatchImpl

class, which provides a default implementation of the

IDispatch methods in a dual interface. For more information

To use this class:

Define your dual interface in a type library.

Derive your class from a specialization of IDispatchImpl

(pass information about the interface and type library as

the template arguments).

Add an entry (or entries) to the COM map to expose the dual

interface through QueryInterface.

Implement the vtable part of the interface in your class.

Ensure that the type library containing the interface

definition is available to your objects at run time.