Mirroring a display to an external monitor and obtaining information on it under OS X

To mirror what is displayed on a laptop's screen to an external monitor under Apple's OS X operating system, take the following steps after connecting the external monitor:

1. Click on the Apple icon on the upper, left-hand of the screen and select System Preferences.
2. Under Hardware, click on Displays.
3. Click on the Arrangement tab for the display and check the check box next to Mirror Displays.

   

You should then see a copy of the information displayed on the laptop's builtin monitor also displayed on the external monitor.

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