How do I get pressed keys to appear as overlay on screen?

in macOS edited January 2014
I've seen a couple of clips on YouTube, where as keys are pressed on the keyboard, they appear as an overlay on the screen.

I'd like to know how to do this. I'm teaching students how to use CS4, and I'm recording simple movies showing the cursor/menu movements ? but the one thing that doesn't appear, is if I hold down say the ALT key or similar.

Does anyone know if there is a way to make the pressed keys appear as an overview on the screen, so that they are captured along with the movie?

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