This article is not true!!
I have a Imac 27 Mid 2010 and after reading the article I bought a ridiculously expensive Thunderbolt cable to use my MAC as a monitor, but it does not work!! The cable is fine because on another iMAC it does work, by my IMac 27 is Mid 2010 and this article says it should work. Why isn't apple realising a firmware update hiwch makes this possible? I stept over from Microsoft to Apple because I did not like the way they were doing, but Apple is really becoming more and more like Microsoft...
iMac, Mac OS X (10.7.5), Mid 2010