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The only known way is to pretend to quit the game with cmd-Q. An "are you sure?" dialog will pop up; at that point click on the dialog but NOT on the "Yes" button. Then you can cmd-tab around.
Just tried this and I don't get a dialog box when I cmd-q -- nothing happens. If I cmd-SHIFT-Q then I get the Mac "Log Out" prompt -- and indeed, I can tab out, but then I can't tab back in :-S