Overhead Projectors

I have an Overhead Projector in my classroom. Is there a way to switch the computer screen off and leave the LCD projector on? I want to show a PowerPoint and then check my e-mail or grades, but I don’t want the whole class to see and I don’t want to keep turning the projector on and off.

Some projectors have a mute button or an option to switch to another channel. Both of them make it easy to go back and forth.

Portable Overhead Projector

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