Hi there,
Do you use Google before you post your questions here? If not, I strongly suggest you do so. Google will give you faster, and probably better / more detailed answers. There are many articles / tutorials available that explain in depth how you can use ASP (or whatever server side technology it is you want to use) for user authentication, including logging out:
http://www.google.com/search?hl=en&q=asp+login+logout
Cheers,
Imar
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Imar Spaanjaars
Everyone is unique, except for me.