online play on mac

Hi.

I have a problem:) Me and my friend have startet a game online. But he can not log on my pc.. i have a MAC pc and he got a windows pc. How can vi play online via IP adr.??? i use stream..

hope that someone can help us:

thanks

Do you use Hamachi?
If not, you should download it here:
https://secure.logmein.com/products/hamachi2/download.aspx
In hamachi you will have to make a server and your friend will have to join it.
Next, he can just fill in the IP address it gives you on hamachi and you're set.