The USB keyboard driver will be implemented when the virtual keyboard driver is combined with the process to deal with USB keyboard's I/O operation.

将对USB键盘进行输入输出的过程和虚拟键盘驱动程序相结合，就实现了一个真正的USB键盘驱动程序。

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At the same time, because the USB keyboard is a HID class device, when the driver is embedded into the operating system, the HID class driver ought to be programmed.

同时由于US B键盘是HID类设备，要把此驱动程序嵌入到操作系统中去，还需要编写HID类驱动程序。

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