How to set up a Demon or socket server?

Question

ubuntu

You can tell in which direction to dig, links, etc..
you need to organize the following scheme:

spoiler

It is necessary that the socket or server daemon determine the client by Ip and return its data to each client.
Sorry if it's wrong .. I'm not very well versed in sockets, demons yet. You can say the minimum.
If there are any other technologies, please write.

Answer 1

write a script in python php bash or whatever comes to hand.
wrap it in the nginx apache cgi interface or whatever is familiar.
finish with a file in place.
what is the question, what is the answer