title: Changing a Magento default theme
body: <p>My understanding of Magento is that you can only have 2 themes loaded at any one time. ( according to the <a href="http://www.magentocommerce.com/design_guide/articles/working-with-magento-themes#head-hierarchy-of-themes" rel="nofollow noreferrer">Magento design guide</a>)</p>
  
  <p>Also, that there is two types of themes - default and non-default (i.e. default contain all possible options, non-default override a subset).</p>
  
  <p>All the documentation I've read says that both default and non-default themes are set in the configuration-> section. I don't see how I can have a customised default theme (not called default) and non-default theme at the same time. Do I have to rename my theme to default in order to use non-default themes?</p>