I was looking to expand my game into the multiplayer realm. My current blackjack simulator it on:
lucreenliven.com
but now I would like the users to be able to sign in and play together, possibly keeping a running count of chips and see who got the high score of the week/month. But I have no clue how to make it multiplayer.

I know I need a server/client-based program and the client will only handle mouse clicks. Can anyone give me a tutorial or some insite on how I would go about this?

Beat the casino at there own game @ lucreenliven.com