[jadmin] gateway help

[Eswar Goda]

Hi,
All the web pages I read claim that both the jabber client and server 
are open-source.I am particularly interested about multi-protocol 
chat.How does the gateway talk to the particular destination server?IS 
the transformation from XMPP to that particular format or protocol part 
of the server source code?Does yahoo,gmail etc provide APIs to the 
gateways to create messages that are to be understood by their 
servers?If yes,can I include that in the client code to make the client 
capable of talking to those severs directly?

Do they have licensing issues there?If I want to write a new server 
tomorrow, should I get a license from the respective domains to add 
those gateways in my server?What should I do if i want the server code i 
write to talk to these people like MSN,yahoo,gtalk etc...?Please help

Please help me understand this.
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