RAWINPUTDEVICE Rid = {};
Rid.usUsagePage = 0x01;
Rid.usUsage = HID_KEYBOARD;
Rid.dwFlags = RIDEV_DEVNOTIFY | RIDEV_INPUTSINK;
Rid.hwndTarget = hWnd;
RegisterRawInputDevices(&Rid, 1, sizeof(RAWINPUTDEVICE))
...