private static bool TxClientToScreen(IntPtr pThis, ref tagPOINT lppt) => GetHost(pThis).TxClientToScreen(ref lppt);
public static extern bool GetCursorPos(ref tagPOINT pt);
public static extern bool ScreenToClient(IntPtr hwnd, ref tagPOINT pt);
public static extern bool ClientToScreen(IntPtr hwnd, ref tagPOINT pt);
public static extern IntPtr WindowFromPoint(tagPOINT point);