What is the most logical next event?

How to screenshare (screencast) on google + hangouts
Open up the hangout you'd like to run the screencast in.
Hover over the picture in the center of the screen.
If you are the only person in the room at the time, you'll see a black screen; hover over the black screen instead.
Look and click on the green computer icon. It has an arrow shooting out of it from the left hand toolbar to the page.