If you hold down the Option key and press the brightness keys (F1 and F2) it will bring up the System Preferences, Displays pane. You may need to hold down the “fn” key too, depending on your keyboard settings. You can also get the Expose & Spaces pane with Option+F3, and the Sound pane with the two volume keys (F11 and F12). Older keyboards will work slightly differently, so experiment.
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