Daemonius,
The DualHead2Go, be it the analogue or digital version, is really a product designed for laptops (hence the VGA input). If you want to game in dualhead on your system, all you have to do is horizontally span your monitors using your video card drivers. Windows (and thus your games) will then see a screen that is twice as wide as it is now, but the same height. For example, if each of your 22" monitors has a resolution of 1680x1050, Windows will then see a single monitor with a resolution of 3360x1050.
You don't need any additional hardware to do this. However, you will have monitor bezels in the center of your view, which is why there isn't much dual-monitor gaming going on.
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