Popup window displaying currently pressed key.
 

Hello,
I am looking for application/method to display popup window each time, when I press the button on my keyboard (the popup window should display currently pressed key).
Do you know any?

I want to create movie about doing some stuff under Linux console, but as you know sometimes person watching such movie is confused because something happened (for example d10d in vim deletes 10 lines and it could be hard to notice that fact watching only console).

Thank you for any help.

You could modify a keylogger. Or use a script to read the log of the keylogger and send those key to the screen with xmessage.