sharepoint 2013 autohosted, lists where are stored?

Hello i have a big problem with understanding of working the sharepoint 2013 autohosted apps.

Question nr 1. where are lists stored? for example custom list, contact lists?

question nr 2. Could anyone explain me http://code.msdn.microsoft.com/office/SharePoint-2013-Use-event-8b5a551f     this example. how it works. i understand that it is listening the list when event occurs.

but my question is which list it is listening to? how to simply check that event receiver is working?

question nr3. in code above i can get lists in code by: clientContext.Web.Lists

but can i access them in sharepoint portal?

best regards