Site Index provides a complete list of all pages and news items in the project in an alphabetical order.
Click on an alphabet in the index to view a list of pages whose names start with that particular alphabet.
Click on any page in the displayed site index to view the page.
Pages displayed in the site index can also be moved to another project or deleted.
Select the checkbox for the pages you want to move or delete, and click on the 'Move Pages' or 'Delete' button respectively.
This makes it very easy to delete or move pages without having to open the pages in edit mode first.