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What happens if you span the desktop across the internal retina display and an external non-retina display and then move a window so that parts of it are on both displays? Is it just double size on the non-retina (which would be bad)? Or does it get drawn twice, in both resolutions, and each display gets their appropriate resolution (which would be preferable, but might be overly complex and taxing on the hardware)?


It appears correctly-sized on both displays, at least when I tried it in Lion a few months ago. It's an impressive effect.

If you have Xcode and Quartz Debug you can enable HiDPI on any external monitor and try it out.


Also, if you have AirDisplay and a new Retina iPad, you can run the iPad as a HiDPI monitor.

It'll be a little laggy, though, which probably won't be the case with a non-WiFi connection.




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