Windows would have a "take a look" function, which would allow You to see everything inside. It would work in that way as if we were inside a building, but we wouldn't take and use anything, but only talk with someone inside, put something or give something to someone inside.
A man inside would have a "take a look" function too and could do everything mentioned above, but in another way (to outside) of course.
You could pass a notes and other things by the window (in two directions--->into the building and out of building)
You couldn't enter to a building by window and vice versa
If You won't use a "take a look" function, you will only hear, when people talks loud (same as it's on boats for example)
Sorry for my english
