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

You can try PopWin, It lets you specify buffers that will open in a special window. This window closes when the frame gets out of focus or when you press C-g