Thanks to all knowledgeable commentators for confirming we can, in fact, use the cards thru the window. BUT - I wanted to reply to those who started this thread, so worried about opening a window in the rain.
If you were returning to TV from anywhere on a rainy day, you were already out in the rain in order to get from the restaurant/church/shop/bar to your car. You got a lot wetter doing that than rolling down your window.
