The system is able to block content by preventing IP addresses from being routed through, and consists of standard firewalls and proxy servers at the six Internet gateways.
"If you log onto a computer in downtown Beijing and try to access a Web site hosted on a server in Chicago, your Internet browser sends out a request for that specific Web page. The request travels over one of the Chinese pipelines until it hits the routers at the border, where it is then examined. If the request is for a site that is on the government's blacklist – and there are lots of them – it won't get through. If the site isn't blocked wholesale, the routers then examine the words in the requested page's Internet address for blacklisted terms" – Clive Thompson, a New York Times journalist, who travelled to China and talked to dozens of national entrepreneurs and interviewed Google’s CEO,
explains how "The Golden Shield Project" is organised. For example, searching the BBC* site in Beijing you are able to read articles about sport, but not news. If you google "Tiananmen Square" there will be photos of tourists and happy Chinese couples, not the protests of 1989.