Hm. Most Germans probably use the German keyboard layout which has a key for the ß character. I guess I'm pretty odd in that I use the "US English International" (or similar) keyboard layout which supports the German characters via dead keys. Except ß, which is the right Alt key plus s. (The left Alt key plus s is just a regular Alt+S. US Intl changes the semantics of the right Alt key.)

For Polish, does the left Alt key generate "ś"? Or the right Alt key? Or both?