i'm writing a web-based game which works a bit like a message board. moves are made by
submitting a form, the contents of which are sent by asp/php to a db.
at the moment, the only way to find out whether there has been any move since one's own move is to refresh the page at the client's browser. This places an uneccessary load on the web server when there has been no update to the db in the meantime. is there a way for the *server* to refresh the browsers, or open popups for my users?