-
Start screen using the command:
$ screen -S <SessionName>
The -S switch gives the session a name, which makes multiple screen sessions easier to manage.
Allow multiuser access in the screen session:CTRL-A
:multiuser on
CTRL-A
:acladd <guest_user>
$ screen -x <host_user>/<SessionName>
Article on using sharing screen and using it as a teaching tool
Here's an article I wrote building on the same subject:
http://www.hollenback.net/index.php/TeachingWithScreen
the ability to share screen sessions with others can be tremendously useful. Also screen's built-in logging ability can come in very handy.