In chat program....

Can two clients connect to one server with same port number....

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Yes, but not socket

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If Server accepts connection at port no 4242......

Q No 1:

So can two clients connect at port no 4242........

Q No 2:

Can server listen connections on two port nos.....

Q No 3:

What do u mean by .......how to start server?

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Yes

Server can listen to two different ports of different application, each application will have their own port that server will listen to.

I'm not sure what you're asking, how to start a server? As soon as you accept a connection from the client and you assigned a socket for that specific client, server is at the listening state. As soon as you run your server, it started...

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