what dose this paragraph mean?

NTDEV
1

Walter oney Programming the Microsoft Windows Driver Model:
Chapter 5 The I/O Request Packet:
Cancelling I/O Requests: From the perspective of your driver, the one thing all the requests have in common is that the stack location you receive points to the same file object in every instance.

what are the points?
what is every instance?

2

IoGetCurrentIrpStackLocation(Irp)->FileObject will be the same pointer value for all IRPs sent on the same handle that was opened by your application. This means that if you need to share state across every single IRP on a handle, you can use fields in the FileObject as a way to store that data.

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