;;;would you care to post a sample of how to do it over IDs or session variables?
To carry the ID in a session variable my method would be to get the unique ID once you have validated a user and assign it to a session variable like so:
session("SomeVaribaleName") = recordSetName("uId")
Form now on what ever page they visit, providing the sesion is still active you can identify a user with this value. For more information have a look at:
http://www.w3schools.com/ASP/asp_sessions.asp
Wind is your friend
Matt