Share a console in linux with multiple users using screen

Sometimes you need to see or share some actions that you or somebody is doing in a remote server terminal (lx, mac..).
You can share your screen (join.me is a good solution) but the real way of doing it is to share you terminal / console.

The best way of doing this is using screen  multiuser option.
The procedure es staightforward:

1. open a screen session (-S give a session name):

screen -S screen-multi

2. activate multiuser mode

CTRL-A

 :multiuser on

3. the other user (connected to the same server) has to:

screen -x screen-multi

And thats it, both will see the same session and can write at the same time on it.

More detail about this procedure: http://ubuntuforums.org/showthread.php?t=299286