The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
Net-Trekking is a new game based around the idea of Net-Trekkers that travel their way around the world on mobile telephones. In a similar way to a message in a bottle, Net-Trekkers get dropped off by their owners and they simply don't know where they'll go next as they are completely at the mercy of fellow players who can pick them up, move them on and put them down again. When they have been picked up, the owner of the Net-Trekker and the host of the Net-Trekker can exchange pictures and text. The owner of the Net-Trekker can see the route taken by their Net-Trekkers on a map on their mobile devices.