dehors means outside, as in: Les enfants jouent dehors. -- The kids play outside.
En dehors refers to the outside as a more tangible place and as such has a clear opposite: en dedans. It can also be used figuratively, though.
à l'extérieur -- Il faut repeindre l'extérieur du mur. -- One must paint the outside of the wall.
-- Chris (not a native speaker).
dehors on its own is an adverb, so you use it to say they're playing outside, eating outside etc.
en dehors de is a preposition, so you use that to say outside of something.
"C'est dehors la question" seems wrong to me. I think it should be "hors de question".
Thank you to both of you.
I am getting the feeling for it now!
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