I done project for college it is global access for who are all getting relationship with that institution example student,teacher,Hos,Principal,office staff,store keeper,Managing Director,parents they can access their module only no one can access another one work without getting permission from admin and also i did it for wifi [login to view URL] u attend it outside campus you get third party [login to view URL] u succeed only can access getting log if u try this from outside [login to view URL] it is purely security authenticated ERP.