title: Magento - determine which xml layout file a page is using?
body: <p>I tried reading the documentation but I still don’t really understand how magento's xml layout files work.</p>
  
  <p>In the directory <code>app/design/frontend/default/modern/layout</code>, i see a lot of xml files.  How do I determine which xml file any given page on the website is using?</p>
  
  <p>For example, if I were on the home page at <code>http://mysite.com</code>, which layout xml file am I using?  What if I’m on <code>http://mysite.com/hello-world</code>, which xml file then? </p>