🚀 go-pugleaf

"Remy Lebeau (TeamB)" <no.spam@no.spam.com> wrote in message 
news:423b4b3b$1@newsgroups.borland.com...

> But then, how does the user who has the file know where to send it 
> to?
> Simple - both parties have to be connected to the same public 
> server, who
> then keeps track of the Internet IPs of every user so it can tell 
> each party
> where the other party is located.  That is exactly how Kazaa, and 
> also IM
> services (ICQ, AIM, etc) work - everyone is connected to the main 
> database
> server, who then knows where everyone is.  When one user wants to 
> establish
> a connection with another user, the main server has to act as an
> intermediary while both parties negotiate to decide whom will 
> connect to
> who.  If one user cannot connect to another, then they try reversing 
> the
> direction of the connection and try again.  A router may not be able 
> to
> route incoming connections from the outside world to a private 
> machine, but
> a private machine can always make an outgoing connection to the 
> outside
> world.  Once the connection is established, it doesn't matter who 
> sends
> commands and who processes them.  Sockets are bidirectional.  The 
> user who
> is arunning the server socket for the connection can still be the 
> one to
> send commands to the user who is running the client socket for the
> connection.

How does the other client know that someone is trying to connect to it 
to retrieve a file ?