Multi-user screen configuration

screen_config

user1@localhost $ # Set the setuid bit on the executable
user1@localhost $ sudo chmod u+s /usr/bin/screen
user1@localhost $ ls -l /usr/bin/screen
-rwsr-xr-x 1 root screen 360952 Jan 18 2038 /usr/bin/screen

user1@localhost $ # Update your .screenrc
user1@localhost $ cat .screenrc
multiuser on
acladd bgates,lellison,gvanrossum,dknuth,dnorman

user1@localhost $ # User 1 starts a screen session
user1@localhost $ screen 

user2@localhost $ # User 2 connects to the screen session
user2@localhost $ screen -r user1/