I've got about a year in Java experience, and would like to set up a server and client for an applet game. However, there doesn't appear to be any tutorials out there on anything like I want to use.

I would the server to be able to store an array of x and y coordinates with a player name somehow associated to them, and send them to multiple clients in a short time span. I would like the client implemented in the applet, and be able to request any player's position data.

I'd like to use UDP, because it seems to be the best option for efficient (if less reliable) transmission of data.

If anyone could give me some pointers on how to do such a project, or point me to an appropriate tutorial, I'd certainly appreciate it.