Operation
To start the program, type screen. Screen then creates a single window with a shell in it. You now have the ability to detach and reattach, turn output logging on, etc. But mostly screen stays out of your way. You work as you normally would.
-a is the default key used to send a command to the screen window manager. To create a new window, type -a, and then c. Now you have two windows.
To switch from window to window you can type -a n, to go to the next window, -a p, to go to the previous window, or -a and the window number. For example, -a 7 would switch you to screen number 7. How do you detach? -a d, to detach. If you’re viewing screen number 7 when you detach, screen number 7 will reappear when you reattach. To reattach the next time you log in, start screen with the -r flag
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Also see
http://www.freebsddiary.org/screen.php
http://www.unixreview.com/documents/s=1255/sam9910b/9910b.htm
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