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I want two files open at once on the desktop. However when I click on one, it opens and the other minimizes.

What can I do?

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Are these different applications, different windows in one application? Which application? – Chealion Jun 17 '10 at 4:51

Have you per chance turned on "Single App Mode"? This hidden preference causes Mac OS X to hide all applications but the current active one.

You can tell by running the following command in Terminal.app:

defaults read com.apple.dock single-app

If it prints a 0then it is not turned on. If it prints a 1 then yes, it is turned on.

You can disable this trick by running:

defaults write com.apple.dock single-app 0
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