Serevr Client Communication Programming

I'm looking for source code for Linux netwrok programming.  The program is act like this, when the client register the user name, then data will pass thru network to server.  Then, the server will verify the data.  Easy programming.  But dunno how  to start??
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why not looking at /usr/src/linux/net ?

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      for server see the man pages for socket in linux. create a socket , then bind that socket (see bind man pages) then put the server in the listenning mode (see listen man pages) then wait for the client to login to server(see accept man pages) .
         for client side do the following steps.
          -create a socket
          -connect to server
          - use write or send for sending the user name
          -wait for server response(use recv routine)

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