Bill Gates swears by his three monitors for greatly enhancing his workspace productivity. Now a new study suggests that using two monitors instead of one can increase the speed of certain computer tasks.
According to the New York Times:
In a study commissioned by the electronics company NEC, researchers at the University of Utah recently asked office workers to perform several common tasks using various monitor configurations. They found that people who used two 20-inch monitors were 44 percent more productive at certain text-editing operations than people using a single 18-inch monitor.

People have gone to a multiple monitor setup say they will never go back. With the low cost of flat LCD monitors, it is a no brainer that you should use two monitors, or maybe three.
One of the best benefits of multiple screens is to able to view multiple applications at once instead of having to switch back and forth. You could keep an internet browser open on one monitor and your word processing application on the other.
PC World has a great video that explains exactly how to set up dual monitors.
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