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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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All references to the USB are made on the basis of a USB reference. The USB references are of type USBReference . USBDeviceRef, USBInterfaceRef, USBPipeRef, and USBEndPointRef are USB references that you pass into or obtain from the USL functions. The USB reference is an opaque reference maintained by the USB Services Library.
A device reference is obtained when the class or interface driver is initialized, since it is passed as a parameter to the initialization procedure. The USB reference for a particular USB device can be found in the device entry in the Name Registry and vice-versa by calling the USB Manager. See Topology Database Access Functions for a description of the functions available for obtaining information about USB devices.
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