"In this article I will describe a very useful program: GNU
Screen. Usually this program is used by people who have a shell
account on a Unix server. But it can be also helpful to people who
haven't yet started to use a terminal or even Linux/Unix at all.
Screen--simply--is a program which enables users to create more
system shells without the need of logging in multiple times.
Moreover it allows to leave programs running after you've logged
out. What can it be useful for? For example to continue compiling
or downloading something when someone wants to use the computer, or
to run more than one terminal for one ssh connection. There are
many more possible ways of using it..."