@first you have to download hamachi on
www.hamachi.ccthan you have to create an account and login.
Hamachi connects a LAN with another LAN over the inet. In fact, its a VPN-tunnel (1024bit encrypted).
So you can play the most LAn-only games on the Internet and have youre Windows shares available for the others in the same Hamachi Network/Channel.
Hamachi binds an extra IP adress on your user account wich you have to use to play Freespace etc.
Just download it and try.
I already created a Freespace Network/channel -> Just join:
networkname: Freespace II
password: hlp