so basically :
- Multi Session is just like facebook, gmail or github, you can login anywhere without terminating other session
- Single Session is, when you login (new session), your old session will be terminated (logged out)
Multi Session Tech :
- I only use phoenix session to save session data
Single Session Tech :
- I use ETS for saving where this username is assigned for (*for guid cookie)
- Phoenix session to save session data
- I prefer to use redis (ETS replacement for scaling)