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When enabled, this method has precedence over all other methods, except for vendor-supplied callback routines. If the vendor has enabled CDC and WMCDC enumeration in the USB generic parent driver, the generic parent driver uses union functional descriptors (UFDs) to group interfaces into collections. For more information on the enumeration of interface collection using vendor-supplied callback routines, see Enumeration of Interface Collections on USB Composite Devices.

If the vendor has registered a callback routine with the USB Generic Parent Driver (Usbccgp.sys), the generic parent driver gives precedence to the callback routine, and allows the callback routine to group interfaces rather than using some other method. These four methods of enumeration of interface collections are arranged hierarchically in the following manner: The USB generic parent driver (Usbccgp.sys) can enumerate interface collections in four ways. Interfaces on a composite USB device can be grouped in collections.