"GGC is implemented as a set of servers deployed in your datacenter, remotely managed by Google."
Basically you're leading the greedy little boy Google by the hand to the back door of your house, unlocking the door, and going on about your business. "Don't you go in now, kid".
All you need to do is sign up and wait in line. Disclaimer: this link is my referral link and will bump me up the waiting list. You can sign in and create your link too :)