[anthk]

I am no kid but screen(1) dates back to 1987 and any wise sysadmin would put that advice on every ~/.login or /etc/motd so the user could run 'screen' at login, some keybinding to detach screen(1) and 'screen -r' on coming back by telnet.

[dhosek]

I never used screen back in the day (I was primarily a VMS guy then), but that man page is one of the best-written man pages I’ve come across: informative, friendly and just the right level of detail.