We've got a managed app that includes custom Visualforce pages that are exposed via a Force.com Site. We're working on a new version of this Site, that is basically a single page app running within a Visualforce page. So, basically, in order to switch between the old version of the Site and the new version of the Site, I just change the "Active Site Home Page" for the Site. However, there is some back-end business logic that I want to enable when I know that the new Site is active (namely, configuration pages for the new Site). I want to be able to enable this business logic when I detect that the Active Site Home Page is my new Visualforce page, and not the old one. I see there is a queryable SObject called Site, but there is no field on it that records the Active Site Home Page setting. Does anyone know if there is a way to determine which page is being used as the Active Site Home Page from Apex code?