Dynamic Website Question!

Hi, I want to have a PHP website that feeds information off a mysql database. But generally changes occour and instead of asking users to refresh the page to get the updates is there a way to provide the updates without them needing to refresh the page? E.G. For like shooping Carts, Chat rooms, etc... Is there a way in PHP or something to make updates show up live as they happen instead of the yucky meta refresh tag in HTML? Thanks for your time in advance. Jerry http://personals.yahoo.com.au - Yahoo! Personals New people, new possibilities. FREE for a limited time.