Urgent_Socket Programming through firewall

Hi all...
I am developing multiple client-one server application through socket programming.
I have one client who will send real time data on request of another client.
This whole data will pass through socket connection.(something like video conferencing)
Steps:
1.Client B sends request to Client A through server.
2.Server accepts connection and gives Client B's IP address and port number
to Client A.
3.Client A sees the request and starts transferring real time data to Client B by opening Socket connection.
I have following doubts:
1. What exactly role of server
2. Important is What about firewall?* This communication has to happen through firewall also.*
What technique has to be used to pass data through FIREWALL.
Thanks In Advance.

Hi..
can you please give me some details about how to write program using SOCKS.
i have developed simple application using Socket and Server socket.
I want this application to be run over web,from anywhere,from any machine.
Thanks

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