We STRONGLY recommend this, and for most people, it's as easy a plugging in an extra monitor to your computer.
 
Many newer computers, including most laptops, are already set up with an extra monitor port. Just plug in the extra monitor and turn on the computer. You should then get prompts to ask you how you want them set up. The choice you want on a PC (vs. a Mac, which we know nothing about) is Extended Desktop. This lets you click and drag anything that is not in "full screen" mode from one monitor to the other. If a window is in full screen mode, shrink it first, then you can click and drag using the top-most bar on the window.
 
If your computer does not have an extra monitor port, then you need to add a new video card. The best way to go is to get a dual monitor card, rather than adding another single monitor card. The dual monitor cards are now very inexpensive and much easier to set up than two single-monitor cards. (You can even have four monitors by buying two of these dual-monitor cards.) You can pick up a really nice monitor at Dell for as little as $120-$150 and a good dual monitor video card for $25-$40. www.dell.com, or stop by your nearest Best Buy, tell them what kind of system you have, and they'll recommend a card.
 
I'm sorry, but we cannot offer support for setting up dual monitors because there are so many different video cards, computers and monitors.