This class implements IUnknown and the IPointerInactive interface methods.
Your class, derived from IPointerInactiveImpl.
An inactive object is one that is simply loaded or running. Unlike an active object, an inactive object cannot receive Windows mouse and keyboard messages. Thus, inactive objects use fewer resources and are typically more efficient.
The IPointerInactive interface allows an object to support a minimal level of mouse interaction while remaining inactive. This functionality is particularly useful for controls.
Class IPointerInactiveImpl implements the IPointerInactive methods by simply returning E_NOTIMPL. However, it implements IUnknown by sending information to the dump device in debug builds.