As we all know tmux is quite nice tool, but there are some scenarios that Ctrl+B cannot be used.
For example, when I sshd to server A and now I connect to A's tmux pty. So Ctrl+B is captured by server A.
Then I ssh to server B from server A and tmux is already running on Server B. This time, Ctrl+B only works for server A and cannot be used by server B. So, if I want to switch window for server B, what should I do then?