IMac as second monitor

I have a 27 iMac and a 24 iMac.
Can I, and how do I, go about using the 24 iMac as second monitor?

Niel, forgive my ignorance, I am trying to wrap my mind around this.
I have a 2009 24-inch, and a 2010 27-inch. The easiest solution would be to run male to male mini display cable between both machines and use the 24, with the 27 as the second monitor.
However, if it is not too much hassle, the opposite could be better.
To use the 27 and have the 24 as the second monitor, you say I would have to "set up a network".
Is that merely running a cable, or what exactly is involved?
And, after setting up a network, I would use the ScreenSaver application.
Presuming that I was successful in setting up and running the 27 via this method, would the ultimate result be slower than running the 27 as the second monitor?
I do not do any games or graphics, primarily making books with CS5.

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