When connected to an HDTV, I can turn off my MacBook screen (end 2011)?

With a Windows laptop, you can switch between the laptop screen and external displays.  One or the other or both on.  Can I do this with my MacBook end 2011?

When I have my MacBook connected to my HDTV, I just want to see the display on my HD TV.  Can I turn off the MacBook screen?

What happens if you close the Mac?

Tags: Notebooks

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