Techgage posted the basics of Multi-Monitor Gaming
Multi-monitor gaming began with external hardware solutions, it was a tremendously expensive and complicated mess but now it's all at your finger tips with one video card, with usually little to no effort on your part, however, strange things can happen if you don't like doing a lot of research.The Basics of Multi-Monitor Gaming
This guide is meant to cover many of the surprises that might come up when you decide to join the world of multi-monitor gaming. I currently only have an NVIDIA rig that I can work with but this doesn't mean that many of these facts will not also play true with an AMD setup either.
To begin, let's get one thing clear and out of the way; not all of your favorite games (past or present) are going to support multi-monitor properly. The thought of this may sound unnerving but there are many games that do properly support multi-monitor, we even took a look at the benefits of multi-display gaming here at Techgage a few years ago, showing off how some of these games would look.