It depends how you are creating the page that the user is redirected to. Is it the same page with dynamic content based on the userid or is it a hard coded page unique to the user?
If the first then you just filter a recordset that has the page information by the userid.
If the latter then you would probably need to store the html or php page name in the database against the user id and then have a page that filters the users recordset and redirects to the resulting page.
Cheers
Ian