. At any given time, we should be able to answer
questions like: <em>Is the user currently logged in? Are they an admin
user? What post are they looking at? Is the settings screen open?  Are
they editing the current post?</em></p>
<p>In Ember.js, each of the possible states in your application is
represented by a URL. Because all of the questions we asked above—
<em>Are we logged in?  What post are we looking at?</em> —are encapsulated by
route handlers for the URLs, answering them is both simple and ac