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Ater person A starts his screen-session with `screen`, person B can attach to the srceen of person A with `screen -x`. Good to know, if you need or give support from/to others.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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All the manpage says for -x is that -x will "Attach to a not detatched screen session." The simplest case is that the same session may be connected to by multiple login instances of the same user. On how to enable multiuser mode and add users, etc., see this page: http://aperiodic.net/screen/multiuser
This doesn't work at all. Sharing a screen is unfortunately a lot more complicated as I detailed in this article:
http://www.hollenback.net/index.php/TeachingWithScreen