Hi Catherine
On most piano music there is no indication of which fingers to use - except perhaps on educational stuff. One fascinating exception is the music of Leopold Godowsky, about whom some discussion has been happening on this board.
Take a look at the examples which Ian Pace has put up
http://r3ok.myforum365.com/index.php?topic=696.30 and the next (or was it previous ?) page. Looks pretty frightening doesn't it ! Most composers wouldn't be so presumptuous to put fingering on a score - there is, after all, probably more than one solution (so we're not talking strict rules). Having said that, some composers suggest a fingering now and again to get a certain effect. Godowsky was one of the most able pianists ever, so I imagine pianists are rather grateful for his fingering suggestions !