"Control mode is a special mode that allows a tmux client to be used to talk to tmux using a simple text-only protocol. It was designed and written by George Nachman and allows his iTerm2 terminal to interface with tmux and show tmux panes using the iTerm2 UI.
A control mode client is just like a normal tmux client except that instead of drawing the terminal, tmux communicates using text. Because control mode is text only, it can easily be parsed and used over ssh(1)."
"Control mode is a special mode that allows a tmux client to be used to talk to tmux using a simple text-only protocol. It was designed and written by George Nachman and allows his iTerm2 terminal to interface with tmux and show tmux panes using the iTerm2 UI.
A control mode client is just like a normal tmux client except that instead of drawing the terminal, tmux communicates using text. Because control mode is text only, it can easily be parsed and used over ssh(1)."
https://github.com/tmux/tmux/wiki/Control-Mode