Tilt Turn window is a European-style window with two distinct functions: swing it in like a door or tilt the top of the sash into your room for ventilation. One handle controls both operations. The tilt turn is a great window for unique situations where you want additional ventilation or access. This window is effectively three windows in one: it serves as a fixed window, an inswing casement window and a hopper window. This window is effectively three windows in one: it serves as a fixed window, an inswing casement window and a hopper window.