[BRLTTY] PowerBraille2 with NVDA through bRLTTY

[Mallard]

Hello all,

I ahve a friend who is switching from Jaws 6 to nVDA (finally :) ).

She has a PowerBraille2 display, and I suppose the only way to use it 
with NVDA is through BRLTTY.

Not having Jaws installed on her computer, should she install Libusb as 
well?

Sorry, but I have never been really sure about when you should or 
shouldn't install Libusb in Windows.
She is running Windows xp, by the way.

Thanks a lot, also on my friend's behalf.
Ciao,
Ollie