!7

p-subst {
  repeat with ms sleep 500 {
    awt {
      Component c = componentAtMouse();
      if (c != null) {
        Point p = c.locationOnScreen();
        Point m = mouseLocation();
        Point d = new Point(m.x-p.x, m.y-p.y);
        print("Mouse: " + d.x + ", " + d.y + ": " + c);
      } else
        print("Mouse: " + c);
    }
  }
}