Learning to use Screen command in Unix

http://kb.iu.edu/data/acuy.html

If your local computer crashes, or you are connected via a modem and lose the connection, the processes or login sessions you establish through screen don't go away. You can resume your screen sessions with the following command: screen -r

screen                                ==>    Start a new screen
(Ctrl+A) & C                    ==>    Start a new screen sub-window
(Ctrl+A) & K                    ==>    Kill the current sub-window

(Ctrl+A) & (Shift + ")       ==>    Show the list of screens running on the system

screen -r                            ==>    restore to the old screens
screen -ls                           ==>    list of running screens
(Ctrl+A) & (Shift + A)      ==>   rename the current screen