There's no perfect solution to this problem, but a Mac app called Beeno comes close. This free, open source application by developer Uli Kaufmann places your entire second display in a window on your primary display. The basic idea is that you'll be able to see the presentation on your laptop without having to turn around and look at the display behind you. This means you can see the slides in front of you, instead of having to turn around to look at the presentation screen. It also means you can see and scroll through your notes and take control of the presentation, all on one screen.
I've been playing around with Beeno for a few weeks, and it works quite well—certainly I don't think I'll be awkwardly looking behind me during a presentation ever again.
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