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#11
Precisely what Lee was pointing to there. When you look at the back of the case at the video card itself if it provides a primary and secondary port your left monitor would plugged direct to the primary for the usual desktop you would expect to see.
The seocnd monitor then goes to the secondary port. As far as stretching the taskbar over across both screens the one included in Windows won't be able to while a 3rd party toolbar RocketDock will continue to strech across both as long as you continue to add shortcuts to it.