emacs dedicated completion window

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http://unix.stackexchange.com – To prevent confusion, I only run one "window" of emacs and so I use window in the emacs sense. I'm looking to get a window split which, let's say 70 in width, contains the completions buffer on the new split when I start emacs. I think I need to have a dedicated window. What I'm basicly trying to achieve is the following. +-----+---+ | | A | | |---| | C | B | +-----+---+ C = where I normally work. A = the completion buffer (also I would like to have messages and everything that emacs throws at me there) B = a shell. I have now the following added for this purpose in my .emac (HowTos)