Alright, sounds simple enough. One last thing. I've trying looking in many different places, and I can't seem to find and proper documentation on what things like (%d+)% is an %a and %b, etc are. If you can give me a link, or even briefly explain it to me, it'd be very helpful.

Don't quite get how setting up flags before data works. Can you give me some example code?

I want to create a new player when someone connects. Also, to extend my question, how do I differentiate between the different data being sent to the server? ie player position, name, etc.

When someone sends you packets of data to the server, how can you differentiate whether it's the first time or not?