static extern IntPtr SendMessage(IntPtr hWnd, VR_MSG Msg, IntPtr wParam, IntPtr lParam);
static extern IntPtr SendMessage(IntPtr hWnd, VR_MSG Msg, IntPtr wParam, IntPtr lParam);
static extern IntPtr SendMessage(IntPtr hWnd, VR_MSG Msg, IntPtr wParam, IntPtr lParam);
static extern IntPtr SendMessage(IntPtr hWnd, VR_MSG Msg, IntPtr wParam, IntPtr lParam);