Odds are you don't yet have access to Google Glass yet, but the MyGlass app should be quite robust by the time you can buy Google's face-computer. A new update to MyGlass allows you to control the Glass UI from the screencast experience on your phone or tablet.
A screencast on Google Glass is a way to stream the Glass interface in real time to a regular Android device. It's a handy way to show people what's going on in Glass without sticking it on their heads. With this update, taps and swipes on the regular Android device will be able to manipulate the Glass UI remotely.
The update also includes miscellaneous bug fixes, but the screencast enhancement is the headliner. This is probably another staged rollout, so be patient, intrepid Glass Explorers.