But it isn't what I need, Tim. I can't think of any occasion on which I wanted to save or print an entire window and, if I'm going to crop the image anyway, why bother remembering an extra command? It won't save me any time at all, and in the worst case I'll use the wrong command or copy the wrong window (perhaps because I've been interrupted), and have to start again.I understand Peter, but ALT + Print screen captures what you need, it's just a neater more concise way of doing the same thing.
Try it sometime, for example make Chrome smaller than a full size window, do a Print Screen and paste into Irfanview and then do a ALT + Print Screen and paste into Irfanview.