KITL over USB (not RNDIS). Any doc? Any sample?

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I'm really disappointed to know that such a feature exists in Windows CE (in 6.0 for download, too) and be unable to find a single word of documentation or any sample implementation.
I've been using USB KITL for a rather long time on Samsung S3C244x platforms and it works fine, speed comparable to ethernet, but the Samsung driver comes in an object library.
Can please someone give a link to any document or sample, if it exists? Or, in the case, this could be an interesting topic for a post in some MS blogs.
TIA.
Cheers
--
Marco Contenti
PROJECT s.a.s. (MSWEP)
www.projectsas.it
marco.contenti@<see domain above>
.