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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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All of the USB configuration services were not fully implemented in earlier versions of the USL. USB configuration had to be performed manually by the class driver. To make this process less cumbersome, configuration descriptor parsing functions were provided. These functions are still available, and some sample drivers may use them, but it is recommended that you use the configuration services described in USL Functions .
The immediate functions (those that end with Immediate in the function name) may be used repeatedly with the same parameter block to search for interface and endpoint descriptors.
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