Coma is a minimalistic X11 Window Manager. It has 2 framing modes: default, large. Only one can be active at a given time and is specified at startup time: - Default means it will split up your screen into columns just large enough to fit 80 column xterms. - Large means it will calculate the frames based on 161 column xterms (so one can use tmux and split it to get 80 columns in each pane).