For presentations while I am teaching I have a setup with a projector connected as external display that extends the desktop. This is great for Keynote/Powerpoint presentations (using presenter notes), but often I have to pull up a document in Preview or a Browser window to illustrate something. In BetterTouchTool I have an action set up that automatically maximizes the Window I want to show onto the second screen.

Is there a way to duplicate/mirror the second screen onto my primary display?
I certainly do not want to use the "mirroring" option in the systemprefs/menubar as I don't want students to see my desktop/other content on the computer, and also to be able to access other apps in the meanwhile.

I'd just want to have a separate window that displays the content of the second screen on my primary screen. Kind of like screen sharing apps do.

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