yeah, that's a VPN network that you can pay for access to
(although look through the faq, as it has some limitations)
no matter what you do, it'll involve changing your network settings
VPN is a virtual private network
It allows you to create a secure network of machines using the infrastructure of another, larger, unsecure network (Ie. the Internet)
A VPN server consists of a database of user accounts, associated encryption keys and access privileges
a client logs into the VPN server, and can access other network resources controlled by the VPN server, all encrypted, all secure
for example, this allows several branch offices of a business to share printers, file storage, etc. over the internet in a secure manner
problem is, because it's a full network solution, it's complicated and expensive to setup your own
A system like the one linked above is fine, but you don't control the VPN server