The page.php defines the various types of page layouts that are required in a ClearOS web interface.
|A standard configuration page (meat and potatoes)
|A configuration page that requires extra width
|A report page
|A report overview page
|Marketplace and potentially other special pages
|A minimalist splash page (e.g. web proxy warning)
|A minimalist splash page that allows company logos/themes
|The login page
|A wizard page
|The graphical console page
The theme engine loads the core/page.php file in your theme directory and expects to find the theme_page hook defined.
The parameter page provides a whole bunch of information that you can use to build out your layouts.