After a bit of hunting around in the newsgroups I have seen posts inferring
that there are problems with multi-function devices when one of the functions
is CDC class. Is this true?
We're working on a composite CDC (tentatively using usbser.sys) and mass
storage device (using usbstor.sys). Can anyone add whether or not this has a
chance of working, or do I need to bypass CDC and write a custom serial
driver in order for the two functions to be handled correctly?

the problem is grouping. the generic parent driver would not konw to split
out the 2 CDC interfaces as one child. usbser expects both interfaces to be
there.

d

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"GaryS" <gstephany@nospam.quest-technologies.com> wrote in message
news:5813A43F-1E2E-4955-99FC-29051ADF4E47@microsoft.com...