This article provides the steps for using the Display Link software solution to extend the Mac Mini to a third display. The third display generally will be a classroom TV or Projector with a dual monitor instructors station.
Instructions
 
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	Login to Mac Mini 
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	Click Spotlight Search Icon 
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	Search DisplayLink Manager. Click to run. 
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	This will send display to the third monitor, which is likely a TV or projector (or both). 
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	After running, the Display Link icon will appear in the taskbar. Click the icon to set personal preferences.
 Select “Launch automatically after logging-in” for the software to start automatically every time you log-in.