I have a dual screen with my macbook.. and I want to close my macbook and use the attached screen. When i close my macbook it goes to sleep and turn off both monitors. I have the dock and apple bar on the other screen. How do i make the macbook able to shut and just use the secind screen with the macbook shut? All-in-all, i want to close the macbook and use the other screen. How is this possible?