Requesting an MSOS descriptor?

I

IUnknown

Using USB Universal test and HCT12.1 on a webcam and TWAIN driver (XP,
2k) .

I noticed that in the USB Descriptor test, it mentions something about
"Requesting an MSOS descriptor".

What is this and how do I know whether or not I need one? All of my
other descriptors are being read just fine.

Thanks
 

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