Description: Make your surfing position within Google Earth visible for others while you can see others at the same time. A few seconds after you stop surfing, your position is updated and new data of the others will be retrieved.
If you register, you can add a personal description with images and links aswell as your skypeName. Adding your skypeName makes you skypeAble, but this skypeAbility can be switched on/off from within GE at all times.
Unregistered GEople cannot see registered GEople, UnSkypeAble GEople cannot see skypeNames of others GE-Skypers.
One needs to register either to see all, or to add that extra info or in case they either share their IP with others or their IP is hidden.
Everything is explained in the file under 'How it works'.