Find ways to connect two or more devices to a remote control such as a multiple choice competition program, true or false, or drag and drop

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C#

ASP.NET

.NET

hi:
Find ways to connect two or more devices to a remote control Such as a multiple choice competition program, true or false, or drag and drop
Students or contestants enter the program and register their name
Then communication is made between the devices to make the competition
Show me the names of those who entered the program
I can send them multiple choice questions at the same time in real time
I can send them questions with true or false and wait for them to answer

But the devices are not in the same network. Is it suitable for desktop devices or is it a website?

What I have tried:

I hope you will guide me on the right path, thank you