How can I mirror one Mac with another?

Episode 1286 (1:30:41)

Donavan from Rancho Cucamonga, CA

Donovan recently received an iMac from 2006 and just got it upgraded to OS X Lion. He would like to mirror his MacBook Pro so he doesn't have to pull it out all the time. Donovan should check out and it will tell him the most recent version of the OS that his Mac will support. But OS X uses VNC to do it.