How do forums ie PHPBB and gmail know if I've viewed a topic or not?

I can think of only 2 methods - 1 is session, and the second is
database.  However, if I change computers and therefore changing my
session it's still able to ensure track what I've viewed.  It
therefore leads me to believe that they are tracking via database

If that is the case?  What would be the logic to set this up??

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