Abstract: A window structure which may be used as a rear window in a pick-up truck or the like. In certain example embodiments, the window structure includes a slidable window panel or sheet located between a pair of fixed window panels or sheets. The slidable window panel may be approximately flush with the fixed panels when in the closed position, but not in the opened position. A seal carrier may be supported by the sliding window, and a bulb seal may be supported by at least the seal carrier so as to cover gap(s) adjacent an edge of the sliding window panel. A latch assembly is provided including spring biased pins adapted to laterally slide in the tracks of upper and lower frame members, respectively, during opening and closing of the slidable window panel.