Network Games!

An online game is really hard on flash so i've decided a while ago i should make a network game. the problem is i can't find a way to send variables from a swf in a computer to the same one in another computer.
if you could please tell me the script, or even the class i should look into, i would appreciate it.

By the way: i have tried localVariables so don't mention that without telling me how to make it work.

I have also tried loadVars(); but that seems to never work for anything, ever.

if you need to use XML, tell me how to do that with script!!!