Yes, when you're in control of the page, it's nice to be able to have different parts of your app ready-to-hand. In our case, that means Documents, Notes, Projects, Accounts, Organizations, and so on...
If your "app" is going to be embedded as a part of someone else's page, then you have to be much more careful. The results cards in the sidebar here are only exposed through a single variable: "eg2012.Card":
