have you not tried? there'll be a button to press
or if it's an older car, a handle that you turn round and round and it makes the window go down
( spesh., Sun 3 Jul 2011, 20:47, archived)

I've had no need to open a window previously. I have to drive later on tonight so I'll give it a go.
Not sure what benefit I'll get but it's a new experience I guess.
( Harold Bishop's Love Child some sort of terrifying sex magician., Sun 3 Jul 2011, 20:59, archived)