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13 1.1. Basic concept or 'What is an URB?'
21 - Execution of an URB is inherently an asynchronous operation, i.e. the 
33   data to an endpoint while your driver handles completion of another.
40 Some of the fields in an URB are:
79 endpoint descriptor in an interface that it's claimed.
82 1.3. How to get an URB?
94 To free an URB, use
98 You may free an urb that you've submitted, but which hasn't yet been
120 1.5. How to submit an URB?
148 1.6. How to cancel an already running URB?
150 There are two ways to cancel an URB you've submitted but which hasn't
151 been returned to your driver yet.  For an asynchronous cancel, call
160 To cancel an URB synchronously, call
205 Note that even when an error (or unlink) is reported, data may have been
260 called, just like other URBs.  If you want an interrupt URB to be restarted,