Can I connect my desktop Mac to my laptop Mac and use the desktop Mac as a monitor?

I have a late 2012 iMac with a 21" display at home. My work computer is a MacBookPro from early 2011. I would like to connect the laptop to the desktop and use the desktop computer as a monitor. Is this possible? I've heard everything from "yes you just need a USB to USB cable" to "no, only 27" monitors can support this".
Straight answer please?

Welcome to the Apple Support Communities
That's possible. 27-inch iMacs and iMacs with Thunderbolt (Mid 2011 and later iMacs) can be used as an external display for other computers > http://support.apple.com/kb/PH11302
The Late 2012 iMac has got Thunderbolt ports, and your Early 2011 MacBook Pro has got also Thunderbolt, so you just need a Thunderbolt cable to connect both Macs. Then, press Command and F2 keys in the iMac to use it as an external display for the MacBook

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