LOL, my keyboard was made in Korea in the last century. No chance it has some magical gimmicks that make it possible to type Polish characters. It's the Windows that allows me to do it: if I had US version, I'd have to use special residential driver - Central European edition has those character maps and drivers built in, so when I press rightAlt+a/e/o/c/s/n/l/z/x I get my letters. If I want those letters used by motti, I have either to run Character Map tool or use Alt+digits_combo. Please note I use "Polish programist" subset, the "Polish" subset uses the key setup like in standard Polish typewriters (which would give me a headache).

But of course such keyboards as you described do exist, e.g. Russian ones, not to mention Japanese etc. Maybe there is even a Polish one, but I hope that I'll never had to work with it