Ed Leafe has posted a note recently on his ProLinux mailing list pointing to this article, and OSNews joins in today: GNU Screen: an Introduction and Beginner’s Tutorial. Screen lets you have multiple virtual terminal sessions and toggle between them all from one terminal. You can also detach from a session and reattach later. Ideal if you have a costly or infrequent dial-up connection and you want to log onto a remote machine, start some tasks and check back on their progress later.