I'm writing a program that should be able to handle commends from any HID device connected to PC. I've already managed to get handles to all the devices, but I need to register them using RegisterRawInputDevices to be able to recieve their WM_INPUT messages. And so I need to pass RAWINPUTDEVICE structures to this function. As well as a handle to a device, this structure has "usUsagePage" and "usUsage" in it. I couldn't find any info about these and how/where to retrieve them. How should I set them? (Sorry 4 my bad English, I'm Russian)