How can I specify the AltGr key as prefix in my tmux.conf? Which keycode or name should I use?
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AFAIK virtual terminals or terminal emulators don't generate any sequence of bytes upon sole AltGr (or Shift, Ctrl etc.). In other words: there is nothing tmux gets and can use to detect AltGr. See "Text mode application, running in a terminal" [here](https://unix.stackexchange.com/a/116630/108618). Maybe some terminal emulators can be configured to generate some custom sequence upon sole AltGr, but this would be nonstandard. Only after you do this customization, it's time to configure tmux. Are you willing to reconfigure every terminal emulator you use? – Kamil Maciorowski Nov 03 '22 at 10:53