Like many others, I rely on
screen heavily. It's a fantastic way of getting work done when you need to be able to drop and come back later.
It's also an awesome teaching tool by allowing folks to all login to the same account and then
screen -x the session so everyone can see how to accomplish a specific task.
Is it possible to prevent the sharing that screen allows with the
-x flag? Or to limit it so that in order to reattach or join a session you need to provide a password?
Do I need to be looking at the 'acl' features of screen, and, if so, which ones / how do they work?