Re: How are pocket windows supposed to work?
I have only seen to similar configurations. One had a double hung window, you lift the lower sash and opened the door. The other was single sash that slid into the side wall and you could then open the door.
Check and see if you have any hardware attached to the top or side of the sash, possible a recessed handle similar to pocket door hardware or if there are stops down inside the door section. I would be concerned that if it slides down into the door section it would not be very water proof.
Be sure you live your life, because you are a long time dead.-Scottish Proverb