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This is the comment you were replying to, attached to the article Using GNU screen's multiuser feature for remote support:

#2 Re: Using GNU screen's multiuser feature for remote support Posted by ebzao (193.252.xx.xx) on Wed 9 Jan 2008 at 11:01 There's one problem: the tech guy must login with the same user. But there's a solution ! Just made /usr/bin/screen with the bit setuid (sudo chmod u+s /usr/bin/screen), and now, after activate the multiuser option, just add an acl like : ^Aacladd techguy[RET], then the user techguy can join your screen by typing : screen -rx yourusername/ And remember than root can always access a multiuser session ! (Note, this tip was already available at https://www.debian-administration.org/articles/34#comment_10 ;-))

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