Sometimes I’m doing a Magento build and e-commerce isn’t the main focus of the site. It happens quite a lot, I end up doing the main site in, say, WordPress and then installing Magento in a subdirectory that’s accessible from the main site through the menu as ‘Shop’ or something similar.
The thing is, when you do that you often want the Magento site to load stright into a single main container category rather than the default CMS page.
You do this by changing the System → Configuration → Web, Default Web URL from cms to the following
Replacing category_id with the category number.