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I just got a Macbook Pro Retina 15". It is sweet.

My old Macbook Pro, which I got in like 2007, can't run anything higher than OS X 10.6.8 (Snow Leopard). My new Macbook runs 10.8.2 (Mountain Lion).

Is there a relatively simple way to use my old computer with my new one, perhaps as an extra screen?

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You will need a third-party software solution for this. – Thorbjørn Ravn Andersen Nov 26 '12 at 10:29

Apple portables doesn't support this kind of behavior as described on their support page. So unfortunately that isn't an option.

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