Thinking there could be a couple of varients.

A) Half width swing outward. Basically the window is 2 pieces, divided down the middle vertically with the left and right halves swinging outward.

B) Upward swing. (Square only) This one would be where the window is hinged near the top and swings upward with a braceboard holding it up.

Nothing too fancy I think with these. Not sure how hard or easy it would be to execute.