Virtually every card that has both these video ports can use two monitors at a time — either showing an expanded desktop, where your mouse moves seamlessly from one monitor to the other (like in this figure), or two separate and discrete desktops.
In a pinch, a DVI-VGA adapter allows you to use the DVI-I port to connect a standard cathode ray tube (CRT) monitor, so you can use two analog monitors instead.
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Source:http://www.dummies.com/how-to/content/your-pcs-video-ports.html
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