Info Window program for computers on a local network?

Question

C++ / C#

Good afternoon!
You need to write a program on your own. TK:
1) the program (PR) is a window with controls (several buttons and fields for entering text);
2) Pr is launched on several computers in the local network (5 computers are combined);
3) when working with controls (entering text into fields, pressing buttons) on any of the computers, the response should go through all other computers (example: I press the "Clear field" button and the field is cleared both for me and for all computers) .
Tell me which way to go? I have basic knowledge of C# and WinForms. The program, in fact, is conceived for pumping skills in order to tell / show something at an interview

Answer 1

Typical client-server application. Write a server (runs on one machine), write a client (run on 5 machines with a connection to the server). On clients, you create processing for any button presses, clearing fields, etc. sending a command to the server. The server receives the command and sends it to all other clients.
Here is an example

Answer 2

Networking is a decent chance to show a bunch of mistakes, not your skill in programming.
If possible, I would dump this matter on some ready-made solution.