okay guys -- i just returned from germany where i spent 10 days painting my father inlaws tilt/turn window. The engineering on those windows is the best. The windows are actually 2 separate panes held together by a twist pin. a key seperates the windows. There is a 1 to 1.25 inch space between the windows where a window blind is mounted. Curtains can also be used. A control string to operate the blind comes out of a small hole at the top of the window frame. Because the blind is between the 2 windows it stays cleaner, longer. The windows are mounted on a peg type hinge so that they simply lift off the hinge for removal. The windows also seal tight when you close them because of their 3 tier design. Marvin Windows make a tilt/turn window - not sure of the price though. You can call them at 800-346-5128 or in canada 800-263-6161. Yeah, the german windows don't have screens but since the window operates into the house why not make screens and mount them on the outside frame?