Force the linux user to move its ass from the screen.
This software forces a user linux to move its eyes from the screen by 'wildly' lock the screen about a specific time. (default is 45 minutes). The function could be also use to watch the time spent by kids on computer.
Another function based on the login/logout cycle is to log on file the time spent on screen between a login and a logout. Could be useful in order to manage the time on a project.