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Next, click on Screen 2 (Projector), and in the Multiple Displays section, select "Duplicate Displays
2 and 3". Click Apply.
Next, select the display that says 2|3. Check the "Make This My Main Display" box, and click
Apply. Now, the displays on the MirrorBoard and the projector should be visible.
Next, click on screen 1 (or the computer's main display). In the Multiple displays drop down box,
select "Disconnect that display". Close all of the Display properties windows.