Quick note on remote access

I haven't quite figured out how to do it yet, but here are a few keywords to go with on my next look at this: OpenVPN, Tinc, STUN. (And should anyone come across this post who knows how to connect two systems that are behind NAT/firewall/routers, without changing the config of the routers, and using only open, well-audited code, please leave a comment!!)