Making a program to be updated by users [closed]

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With only 20 users or so, your options are pretty much wide open. You can use TCP or UDP, a web server with HTTP. I’d use TCP myself.

It will be easy to update only 20 people with small updates within 15 seconds.

Here’s how to create a TCP server in C#.net
Here’s how to create a simple TCP server in Java.

I suggest using ProtoBufs for the binary protocol. Its simple, compact, and allows you to change your language without needing to rewrite protocol parsing/unparsing code.

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