The instructions on how to install Polish diacritics on a comptuer boggles the mind. For thsoe who are not engineers or technicians, a much simpler solution is to order a No. 214 Polish keyboard (maszynisty or typist's, not programmer's). Then you can type all the lower-case accented letters with a single stroke without having to press two keys (e.g. alt + n to get ń) to type one letter. Quicker, cleaner and handier in every way!!! (Two strokes are required only for the accented capitals which occur only occasionally.)
you forget to add- klawiatura maszynistki /typewriter keyboard/ is really rare in poland.
despite i've lived there ca. 20 years, i saw it maybe 10times. everyone (ok, almost everyone ~99.99%) uses qwerty keyboard.
not to mention, that switching from qwerty to qwertz (when someone wants to write some text with polish letters) isn't really nice :)
But you never need to switch to qwerty. A 214 keyboard in qwertz arrangement has permanently engraved on the key tops not only ę ą ł ż ó ś ć ź and ń but also the German ß and umlat (¨), the French cedilla (¸), acute (') and grave (`) accents, theˇ used in Czech, Slovak, Croat, Slovenian, Lithuanian and/or phonetic transcriptions of Cyrillic (è š ž ř), even the ogonek needed for the Lithuanian į and ų, as well as the degree sign as in 12°C. With all that right on the keyboard, who would ever want to go back to the very limited and unwiedly querty keyboard. So what if most Poles have uncritically allowed the the unwieldy American keyboard shoved down their throats. Thinking people need not go with the flow just because it's the conformist thing to do!