Winusb - multi device multi application

Hi,
I am going through documentation available on Winusb and it says that
Winusb shoud be used when "the device is accessed by only a single
application".

My question is

1) if i use multiple instances of same application to communicate with
different intances of same device(i.e. many boards of same kind
connect to PC via hub) , can i use winusb.

2) if my application communicates with different intances of same
device(i.e. many boards of same kind connect to PC via hub) .
Communication with each instance happens in separate thread. Can i use
WinUsb.

3) Can i use WinUSB in both case

Thanks for an answer

-Anshul