This video covers chat program using TCP sockets. In other words two-way communication between command prompts using TCP sockets.
Link of "Sockets and Socket Programming"(2nd video) video :- https://www.youtube.com/watch?v=U_aWJJ3A1qU&index=2&list=PLRQ7AUhNEHInzF3BN8ifpczTyCYeVub6i
