implementing remember me - token and series
<p>What is the series and token name used for in this SO article? - <a href="http://stackoverflow.com/questions/244882/what-is-the-best-way-to-implement-remember-me-for-a-website">the best way to implement remember me</a></p>

<p>I understand the concept of a random number being used to determine if a user should be remembered...it is sort of like a hidden login....username/token (token is stored in the cookie) as opposed to username/password.  But what is the series identifier for?  How does it fit into the big picture of authentication.  How do the two work together? </p>
