下面那段话讲了些什么

Introduction to HID Minidrivers
HID minidrivers abstract the bus-specific details from
 the HID class. The USB Device Class Definition for
Human Interface Devices, Version 1.0, specification
(USB HID; available at http:
//www.usb.org/developers/hidpage.html ) refers only to
 devices connected by way of a USB bus; Microsoft
provides the HID minidriver for USB (Hidusb.sys) under
 Windows 2000 and Windows 98. Therefore, you do not
need write any drivers for HID-compliant devices that
 are connected using USB. However, by writing a HID
minidriver, you can make most external devices appear
 to be HID devices, regardless of the connector they
 use.            

这段话还真有点意思,hid 设备并不一定是usb接口的，可是微软提供了针对hid设备的中间层驱动（所谓minidriver)，也就是说你如果你针对某种外设（外设的接口可以不是usb接口）写了一个hid设备的minidriver，那么这个设备可以仿真hid设备的功能。