Years ago (decades?), I used a command that turned the mouse into a padlock icon and prevented clicking or typing, but you could still see the programs that were running. You could blindly type your password and it would unlock.
This was useful for displaying a demo (like at a conference) but prevented user input.
Does anyone remember what the command is?
(I thought was xlock, but either thats not it, or I can't find the option in the man page to do what I want...)
