IPortTopology interface provides generic port driver support to a topology miniport driver. In Windows 98/Me and in Windows 2000 and later, the PortCls system driver implements this interface and exposes it to the adapter driver that implements the IMiniportTopology object. An adapter driver creates an
IPortTopology object by calling PcNewPort and specifying REFIID IID_IPortTopology.
IPortTopology inherits from the IPort interface.
An adapter driver forms a miniport/port driver pair by binding an IMiniportTopology object to an
IPortTopology object. The PortCls system driver registers this pair with the system as a topology filter.
IPortTopology interface supports only the methods that it inherits from the IPort interface.