This article will help you to join domain in Tornado os and also login Domain user in Tornado os.
Open System Manager.
Click on Expander then you will get Domain Connectivity Option.
Type password "admin" and authenticate.
Type Domain Server ip and Domain name.
Provide Username administrator and his password. And click on Join Domain.
Then you will get message Connected successfully.
After that Reboot Tornado os then you will get Login Screen.