The Design Guide has been rewritten to provide a more comprehensive coverage of HID support in WindowsÂ 8. This rewrite includes a new Overview, a section describing HID Clients, a section describing HID Transports, and a section describing Non-HID Legacy Devices.
HID Over I2C
The HID protocol originally targeted human interface devices like: keyboards, mice, and joysticks. It was originally developed to run over USB. For WindowsÂ 8, Microsoft created a new HID miniport driver that allows devices to communicate over an Inter-Integrated Circuit (I2C bus).
what's new in HID - windows 8