Does anyone here know anything about this (and understand it better then I do?)

I found this page while searching for info to hopefully help me get better results with this file sharing since I am at a school in China so I don't have any control over their routers and such. But this line on this first page caught my eye:

"An Internet where everyone can create and consume network services, even if they have a dynamic IP address or no IP address, are behind a Network Address Translation (NAT) device, or blocked by an ISP's firewall."

http://www.onjava.com/pub/a/onjava/2...2psockets.html

Hopefully someone here can shed more light on it for us. Thanks