According to my limited research, nothing over 200 zlotych is in circulation, and even then only current banknotes. You can check for yourself going to http://www.nbp.pl/ (there is English version of...
The 500 peso bill is not valid.
The highest denomination is the 100 peso bill.
To see Argentina's Central Bank website: http://www.bcra.gov.ar/ and click on the left side menu under "Billetes y...
It's simply a bank note or "bill". In banking and numismatic parlance, the word currency is often used just to refer to paper money, while coins are considered separately.
The Polish use Złoty (Golden) and Euro. Some countries like Poland, for example the UK, Czech Republic, Sweden don't use Euro, but you can pay in Euro ang get your change in zloty.
In practice...