Online game with chat

Hello! Is flash media interactive server able to help me
build an online multiplayer game with chat between players?
And if it's the right choice, how many users can be online at
one time (on the chat and in private games) and do i need multiple
servers for a large number of users? And if i do really need a more
than 1 server, how the balancing between servers will be made?
Thanks alot!
Dan

Different users have different browsers with different jvms, and they sit behind different firewalls. To send messages from the server to an unsigned client applet you could use polling or piggybacking.

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