To clarify my previous question:
* I have it installed on one PC at home
* I connect via WIFI at home and it works
* I connect via 3G and it works
* I go to my friends house and connect to their WIFI, but cannot access MY PC at home via their internet. I can see the name of my computer, but when I click it I get the error "Authentication failed". My friends do not have the program installed on any of their computers (I almost have them talked into getting the program though).
Thanks for the quick response, I love this program and its support!