Question - Does the SE count everything before the d-o-t * c-o-m as the same website? Can shed some light on this? How does a search engine know when it is leaving one site and then going to another? What prompts the question is this - due to my technical lack of knowledge I may have to install a particular wordpress theme on a root domain - and reinstall it to a sub domain (ex. /blog) - Now If there are 7 options in the navigation bar - the /blog will have to link back to all the corresponding links from the root page. Is this a SEO killer?