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Tmux uses Ctrlb as its prefix, but Ctrlb conflict with Emacs.

I want to bind CtrlAltb to tmux's prefix. I guess it may be C-M-b but didn't work...

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C-M-b works here with tmux 1.6, rxvt-unicode terminal. – Thor Sep 15 '12 at 12:21
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As @Thor has implied, you should post your terminal emulator and tmux version, and possibly even your window manager. – jw013 Sep 15 '12 at 13:59
I don't know why but... M-C-b works... Thanks everyone! – kuanyui Sep 15 '12 at 14:25

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M-C-b works for me. Outside tmux, check what sequence of characters is sent upon pressing Ctrl-Alt-b. If it's Esc, ^B (0x1b, 0x2), then that should work.

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