On our cougar, we have 4 types of windows.
1. vertical slide - there are two levers at the top of the bottom half - press these toward each other as you lift up.
2. Horizontal slide - there is a latch near the center frame of the window - pull inward as you slide the frame toward the center
3. Emergency exit/tilt out - there is a lever that rests in a spring plastic clip.
Release the lever, rotate the lever inward until it is perpendicular to the window, then push outward.
4. crank/tilt out - turn the nob to tilt the window outward.
Hope this helps - our sliding windows where VERY difficult to open and close until I got busy with my can of spray silicone. Be careful and good luck