[joeshaw]

The one downside to tmux over screen is that tmux basically requires that all clients connecting to it have the same screen size, and by default it chooses the smallest one. So while you can connect to an existing session, the output might be ugly.

For this reason, I typically simply 'tmux detach;tmux attach"

[tjdetwiler]

tmux a -d will attach and also detach all other clients.