IMac to iMac connection cable?

Hello nice smart people,
Which cable would I need to connect my mid 2010 iMac to my new 2012 iMac to use as a 2nd monitor? Apologies for the simpleton question....

Thanks. Both are 27inch. Forgive me but I don't trust my own eyes when it comes to tech details.
Is this the proper cable?
http://www.provantage.com/startech-mdisplport3~7STR91L9.htm
Usted es muy attento

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