Social engine customization and data integration

I want to integrate all my sites to socialengine installation so that the users can log in to one website and be logged in to all without having to login to each site separately. and need a great look for [login to view URL] . IMPORTANT POINTS: 1. [login to view URL] will have data of all our members 2. data base in [login to view URL] has to be merged with that of [login to view URL] [login to view URL] data base of [login to view URL] and [login to view URL] has to be merged with that of [login to view URL] [login to view URL] one sign up in any of these 4 it should reflect in [login to view URL] [login to view URL] announced website is [login to view URL] , but since it is using google apps for our e-mails for the past few years , [login to view URL] is redirected to [login to view URL] . I wish to mask [login to view URL] only [login to view URL] needs to be highlighted