Can my several year old 24" iMac serve as a 2nd monitor to my much newer 27" iMac? If so, how please.

A quick question. Can my fairly new 27" iMac use the older 24" iMac as a second monitor?
If so, is it necessary to upgrade the older iMac?
Thanks.

Only 27-inch and Thunderbolt iMacs support Target Display mode, so they can be used as external displays. See > http://support.apple.com/kb/PH11302?viewlocale=en_US&locale=en_US
However, you can use an application like ScreenRecycler to use the 24-inch iMac as an external display for the 27-inch iMac over the network

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