Simon Phoenix pretty much summed it up.. you just got to make sure your video card supports dual displays. Most newer cards that support LCDs should. They'll have 2 video ports in the back, either DVI + DVI, or DIV + VGA, or for older cards, VGA + VGA. Do the right click, desktop, properties, settings thing mentioned above and see if you have two monitors showing. If it does, you are pretty much set. If your card doesn't support dual displays, you can pick up a second card and hope that Microsoft Windows can use it for the secondary. But going with a dual port video card is simpler and probably cheaper. I don't game so I bought a cheap $50 nvidia 6200 card that works fine.

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