Guild Wars 2

Ok so if you have 3 screens the use is obvious if added support is there for the increased angle of view.

But with two screens also very very useful, having a screen to put up your inventory, your gear or map or other stuff you might up easy access to without covering up the screen, the map being huge thing that covers chat and everything leaving you vulnerable to attacks.

Its easy to implement and extremely useful.

Please! I have 2 monitors and the 2nd is just sitting there doing nothing while I play. Since I have to alt-tab to use the browser I have on the 2nd monitor, let me use it to display ancillary windows.

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Most Graphics cards ( high end ) will do this feature for you. A buddy has 4 screens and wraps GW2 on all his screens for a panoramic view. Not sure what he runs or how he does it but he has it done.