by Peter Torr.

The basic premise is that the phone (and hence the applications on it) consist of a set of “places.” A place is a “user-recognizable collection of persistent state” (thanks to Alan Bush for that succinct description!) or in layman’s terms it’s a screen that the user visits that contains information, content, or links to other places. Now since a picture is worth a thousand words, let’s take a look at the structure of a typical content-browsing application…