title: How to run Rails 3 application on localhost/<my_port>?
body: <p>To run Rails application on Windows I do:</p>
  
  <ul>
  <li>cd &lt; app_dir ></li>
  <li>rails server</li>
  </ul>
  
  <p>I see the following:</p>
  
  <pre><code>=&gt; Booting WEBrick
  =&gt; Rails 3.0.1 application starting in development on http://0.0.0.0:3000
  =&gt; Call with -d to detach
  =&gt; Ctrl-C to shutdown server
  [2011-01-12 20:32:07] INFO  WEBrick 1.3.1
  [2011-01-12 20:32:07] INFO  ruby 1.9.2 (2010-08-18) [i386-mingw32]
  [2011-01-12 20:32:07] INFO  WEBrick::HTTPServer#start: pid=5812 port=3000
  </code></pre>
  
  <p><strong>Question 1</strong></p>
  
  <p>Why port 3000 is selected ? Where is it configured ?</p>
  
  <p><strong>Question 2</strong></p>
  
  <p>How could I run 2 applications in parallel ?
  I guess I need to configure one of them to be on other port (like 3001). How should I do this ?</p>