Emacs Lisp Buffer out of focus function?

Question

Is there an emacs lisp function that will allow me to tell if a buffer is out of focus?

I am trying to write a hook that will get rid of the semantics *possible co

Answer 1

Related to your second question, Also is it possible to get rid of the Messages Buffer as well. If you're using ido-mode (and everyone should be using it!), you can hide the *Messages* buffer from the buffer listing with the following elisp:

(require 'ido)
(setq ido-ignore-buffers '("^\*Messages\*"))