The part of Google App Inventor on the web, again it's called Designer, consists of only two pages: My Projects and Design.
As we learned in Chapter 1, Obtaining and Installing Google App Inventor, one gets to Designer by browsing to http://appinventor.googlelabs.com and, if not already on, logging in using our Google account. You will wind up either at the My Projects page as shown in the following screenshot or (if you already have a project in progress) in Design. Left-clicking on the name of a project opens it for editing.
One important concept here: App Inventor Designer may look like just a couple of web pages, but it's really a quite powerful web application. Keep in mind that you are running a program, not browsing a website, and that Google keeps your data (the designs and the blocks we'll click together later) backed up out there in the cloud (those zillions of servers they have all over the place).
But, "whoa, dude", you say. "Don't throw around...