OSX 10.9 has a lot of tuning up under the hood. But it went beyond a tune up and made the sincere effort to huge some huge problems. Like that problem with trying to use multiple damn displays.
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Full Screen apps, which came to Mac in Lion, were great. They were gorgeous, useful, and gosh darn productive. But if you wanted to use a second display, you would have the full screen app on both.
10.9 finally fixes that, allowing you to get at menus, the dock and operate the two spaces completely separately. Thank you Apple, for fixing the headache you’ve given us.