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I am using Ubuntu 12.10.

See this short video of what actually shows up on screen when we successively press the Ctrl key twice:

What does it do? Is it a shortcut? Acts as a Hotkey? A easter egg? What exactly does happen?

Now, once it has been activated, every single press of Ctrl key triggers this action.

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up vote 6 down vote accepted

That's just the "show mouse" highlight.

Settings -> Mouse and Touchpad -> Show position of pointer when the Control key is pressed.

enter image description here

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Oh... I was playing with the settings earlier today, I somehow activated it and forgot about it. Had never seen it earlier so got a bit amused to watch it :-) – Aditya Mar 1 '13 at 22:15

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