On Sat, 20 Oct 2012, Peter Stuge wrote:

> Tim Roberts wrote:
> > You can write to the device's control endpoint
> > without claiming an interface at all.
> 
> I'm not sure this is true with WinUSB on Windows.

It's also not true on Linux under some circumstances.  If the
bRequestType doesn't indicate a vendor-specific type, and if the
recipient is an interface or an endpoint belonging to an interface,
then the request won't be accepted if someone else has already claimed
that interface.  And if nobody has claimed the interface, it will
automatically be claimed for your program.

Alan Stern


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