Human Interface Devices (HID) are supported in the “headful/headed” (viz. headless) version of Windows 10 IoT. Anything that takes users input for an app is an HID device, and can include devices such as screens that provide feedback to the user. Traditional HID devices are the mouse and keyboard, whereas gaming devices such as joystick, XBox controller and steering wheel are also HID devices. A barcode scanner or credit scanner are also be HID devices, A system with just a few push buttons to control it has those pushbuttons as a trivial HID. Technically the HID protocol was developed as a protocol for the USB-HID class such that devices that conform to that class do not need a specific driver.
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This blog discusses a UWP (Universal) app that enumerates the drivers on a Windows 10 system (including IoT). Its like the Windows Device Manager app. Full source code is available.
Peripheral devices can be connected to the Raspberry PI 2 via the four USB host ports. The connected devices can be examined in a number of ways. This blog examines these methods.