The screen utility provides a way to run a command on a Linux system, detach from it, and then reattach later. This is particularly handy if you have a long-running process that you want to keep running even after you log out and still have the ability to reattach to it later and/or from another location.
This is general information about using screen that applies to just about every Linux system, not just those in the School of Informatics and Computing.
Basic Screen Usage
There are many good tutorials available on the web describing the use of screen. There is also detailed information in the screen man page, which you can view by running man screen. However, much of this information can be rather daunting given the sheer number of command line arguments and key bindings. The purpose of this page if to give you the bare minimum of information needed to get started with screen.