The following diagram shows the device node, kernel-mode device stack, and the user-mode device stack for a USB-FX-2 device. The drivers in both the user-mode and kernel-mode stacks participate in I/O requests that are directed at the USB-FX-2 device.
具体请看： https://msdn.microsoft.com/zh-cn/windows/hardware/drivers/gettingstarted/device-nodes-and-device-stacks
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