Answer:
The IUnknown interface lets clients get pointers to other interfaces on a given object through the QueryInterface method, and manage the existence of the object through the IUnknown::AddRef and IUnknown::Release methods.
IUnknown methods can be used to switch between interfaces on an object, add references, and release objects.
You must implement IUnknown as part of every interface.
IUnknown methods can be used to switch between interfaces on an object, add references, and release objects.
You must implement IUnknown as part of every interface.
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