For me, the example shooter when I tried it the first time, it worked great. Me and my friend both had winxp(I'm pretty sure, but not to 100%).
Later, when I made my own example(now on win7) it didn't work anymore(it was the same .exe, I didn't recompiled it). So I tried the perfect working example from scidave and look deeper in the cap to determine the error I made. But it also didn't work anymore. Me and my friend needed to run on compatibility mode. That worked to both, the old .exe and a newer recompiled .exe from scidaves example shooter.
Also, me and Wolod ran the game and he has winxp. He just started the game.exe and connected to my pc via hamachi or real ip, not sure. It worked. I'm almost sure, setting only the server to compatibilimode didn't work. At least, my game.exe needed it too.
I really hope, this plugin runs stable anyday, so I can use it for any of my projects. I would even donate if someone makes a stable network plugin with a few features to determine the players via ID etc.^^