Two-way communication in socket programming using C

I have a small doubt in socket programming. i am able to send my data from client to server and my server processes the data. The o/p of the data processed, I want to send back to my client. So can we "write" the data back to the client using the same socket. I mean a server listens on a port before accepting connection and receiving data, so similarly, do i need to make my client listen to some other port (bind it some other socket) and make my server connect to that socket and transfer the data back. Any kind of example or explanation or references would be appreciated. Thanks a lot in advance.