Page Login Cookie!?

Hello everyone, Im working on some ASP (pretty much just doing random things to learn ASP) and right now Im working on my own fake blog. Im trying to make something where people can sign up and update their own blog. I know how to add records and update and all that but as far as signing in how do I make it so they stay signed in until the sign out and how can I make it so they can only update their “blog”? Im trying to figure out how to pull their ID_no from the password row. Im using an Access database for this. Let me know if anything doesnt make sense!
Thanks
Fidelity88