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Why does it matter that they are treated as one screen other than the fact that the menu bar goes across both screens and the dock, if centered, would be split across both as well? (Okay, I know that you wouldn't be able to move around each individual screen in system preferences, but if you are just using those two screens side by side, who cares?)

EDIT: I wonder if there is a program that would allow you to move the dock off center but still on the bottom of the screen to get around the screen splitting program...

you can use onyX to align the dock to the left or the right instead of the center of the screen, but this does not guarantee that the dock will not be split between the screens. you can use a small dock icon size and magnification to make the dock stay on one half of the desktop.
 
I think that the point is that you have two independent screens so that you can run completely different things at the same time. Having them stretched over one giant desktop on two screens isn't really ideal. I am surprised that given how popular MBP's are, that there isn't an easy solution to this. Are future revs likely to have this capability?... I wonder

I'm not really sure why some people are using the term stretched. It is more like os x thinks you have a single monitor that is twice as long as normal, so it isn't like the aspect ratio will be stretched twice as much in the x direction, because there are also twice as many pixels. Right?
 
I'm not really sure why some people are using the term stretched. It is more like os x thinks you have a single monitor that is twice as long as normal, so it isn't like the aspect ratio will be stretched twice as much in the x direction, because there are also twice as many pixels. Right?

Correct. The big difference is that when OS X thinks you have two monitors, it puts the menu bar on one monitor; the dock on one monitor, etc. (And you can arrange the monitors in relation to each other so you could have, for instance, a monitor above-and-below arrangement.) When you use the Matrox box, it sees both monitors as one single monitor, double width. That means that the menu bar stretches across both monitors; the dock (if on the bottom of the screen) stretches across both monitors, and you are forced to have a side-by-side arrangement.

Likewise, games will display centered across the two, so FPS games will have your target point at the break between the two monitors.
 
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