Can I link a new Macbook to an old Macbook? 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?
Apple portables doesn't support this kind of behavior as described on their support page. So unfortunately that isn't an option.