I have drupal (multi) site configured using domain module.
www.example.com, one.example.com, two.example.com, three.example.com
All site have single Database configured using domain module. Users are restricted to each domain, so user from one.example.com site can not login to 'two.example.com' and other until approved. if user have multiple site access they have to login separately for each site.
So no auto login to any site. No setting $cookie_domain = '.example.com'; in settings.php file
I have another domain called 'help.example.com'. If user is logged in any of above mentioned site, it need to be auto logged in when they visit 'help.example.com'.
any idea to achieve this using domain module settings, or any custom settings ?