Finding all user files

[Brian Clark <brianj@ais.ais-gwd.com>]

Greetings,

Can someone show me a way that I can find all files on a system belonging 
to a specific user or group on a given system?

I've tried to find this out on my own, but I'm having trouble figuring out 
what it is exactly that I'm looking for. :-)

Thanks,

Brian