Question on CreateFile and USBView

Hi:
I have question on CreateFile , If I have driver A(Let said have symbolic
name a). sit on top of Driver B(Let said have symbolic name b). What I
understand is the following:
If user mode use createfile (with first argument b) try to get the handle
for driver B, the IRP_MJ_CREATE will reach Driver A first, and if Driver A
do not pass it to Driver B, then driver B will never receive this command.
If that is the case , How does usbview perform the test , it call the USB
host controller directly with no problem. Do I misunderstanding something?

Thanks in advance

Michael Cheng


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