How to make a simple co-op (2-player) Game?

does anyone use the server service “ElectroServer?” (http://www.electrotank.com/resources/downloads.html)

I believe I could make a simple 2 player game, but I don’t know how to code for the server, so if someone could explain to me how to use it alongside Unity, that’d be great.

I don’t need you to write code for me, I just want to know what their code means (I realize i should be posting on their forum, but i don’'t have the right “permissions” to ask a question)

or if you have a suggestion for a reliable server for small multiplayer games, what would they(it) be?

Thank you for your time.

I havent used the ElectroServer but I have worked on the SmartFox Server. They are similar technologies and its very simple to create multiplayer games using it.

They have a sample unity project available at Multiplayer Island Demo

You should also have a look at at Bootcamp Multiplayer Demo

And you should also consider Unity's networking example