How to tell whether one driver(say driver A) is in the same driver stack with another driver(say driver B)?

I'm new to WDF, so the questions below might be trial. However, I cannot find the answers in MSDN or text book(e.g. Developing Drivers with the Microsoft Windows Driver Foundation)
The questions below only apply to KMDF on Windows Phone.
1. Can I say that one *.sys file is one driver?
2. How to tell whether one driver(say driver A) is in the same driver stack with another driver(say driver B)?
3. If several *.sys files are included in one *.inf file, can I say that those drivers are in the same driver stack?

Drivers are not in a stack, the devices created from the driver are.  Consider having two identical pieces of hardware in a single computer, each will have a device object which will come from the same driver, but each device object will be in
its own stack.  Things can get even more complex since a filter driver can create more than one device object in a single stack. 
Just as a single driver can create devices that are in different stacks, your question on multiple drivers in an INF has the same answer, there is nothing that says they will be in the same stack.
Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com

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