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From: Mathias Dahl <brakjoller@gmail.com>
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Subject: Re: HELP: One Bindkey for Two Different Commands
Date: Wed, 21 Nov 2007 16:57:41 +0100
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Edward <edward.dodge@gmail.com> writes:

> (defun ya-ya ()
>   (interactive) ; new
>   (if (cdr (window-list))
>       (other-window 1)  ; command with argument
>     (call-interactively 'switch-to-buffer))) ; command called
> interactively, argument to be passed at that time

Could it be that what you really want is this?

(defun ya-ya ()
  (interactive)
  (if (cdr (window-list))
      (other-window 1)
    (switch-to-buffer (other-buffer)))) ;; Switch to previous buffer

Just guessing... :)

/Mathias