How to use an iMac as a second monitor for an iMac

I have two 21.5 inch iMac's (late 2009) and I want to use one as a second monitor for the other. I have a Mini DisplayPort to Mini DisplayPort connector but when I connect it to both computers, nothing happens. I'm not sure if I'm doing something wrong once they're plugged in or if I have the wrong cable all together. Any tips or advice would be much appreciated. Thanks

Not going to work, the ONLY 2009 / 2010 iMacs that supported Target Display Mode were the 27" models, 21.5" models simply will not work. Please read Apple FAQ on TDM and you will see I am correct.
Target Display Mode: Frequently Asked Questions (FAQ)
While Neil is correct, Screen Recycler's performance is not that good so the user experience probably will not be worth it.

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