Those two windows allowed a view of nearly all the room.
This is not something which Windows would allow you to do.
A small window in the door allowed him to spy into the central open space.
This window allows you to change the date and time which is used by your computer.
The time that Shakes was taking to lower the window might have allowed the door to open.
The windows thus allow more heat in over the year than they let escape.
Partly opened, the window allowed him to hear the words that passed.
"But they are human beings too, and the window allows people to see that."
A window, which he could leave open, allowed him to escape and return unnoticed at night.
No window allowed him to tell night from day.