Transparent Authentication
Admin>Organization> Manage Settings> Security Tab> Login Security> Links in Emails
Our transparent authentication feature is intended to automatically authenticate first time users based on links in the emails they receive. This is a convenient feature that can cause some confusion if someone forwards emails and has never used the system before; allowing someone else to accidentally login with their account.
With transparent authentication, the system associates their client IP address with a username after the user session is authenticated. This way members avoid having to login when they follow the links on a community email digest.
On the other hand, when a member authenticates via the web application, it remembers their credentials per browser, per device.