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Kind of like Matlab where you can arrange sub-windows within the main window or undock them to become their own separate window like so:
Much better than all the windows of Gimp or the Mac version of Stata. Edited 2009-09-25 00:00 UTC
No, that's per application. I'm thinking of that for every application ( not every application instance), with no application support required ( all handled by the windows manager ).