title: Difficulty understanding nodejs documentation
body: <p>I'm really confused about this section</p>
  
  <p><a href="http://nodejs.org/api/http.html#http_http_createserver_requestlistener" rel="nofollow">http://nodejs.org/api/http.html#http_http_createserver_requestlistener</a></p>
  
  <p><code>The requestListener is a function which is automatically added to the 'request' event.</code></p>
  
  <p>What does the term "added" specifically mean?</p>
  
  <p>Also for here
  <a href="http://nodejs.org/api/http.html#http_event_request" rel="nofollow">http://nodejs.org/api/http.html#http_event_request</a></p>
  
  <p>What does the the code directly beneath mean <code>function (request, response) { }</code>?  Does it mean that that function gets passed each time there is a request?</p>