Supporting Anonymous Users
By default, anonymous users cannot modify Profile properties. The problem is that ASP.NET Framework has no method of associating Profile data with a particular user unless the user is authenticated.
If you want to enable anonymous users to modify Profile properties, you must enable a feature of ASP.NET Framework called Anonymous Identification. When Anonymous Identification is enabled, a unique identifier (a GUID) is assigned to anonymous users and stored in a persistent browser cookie.
Note
You can enable cookieless anonymous identifiers. Cookieless anonymous identifiers work just like cookieless sessions: The anonymous identifier is added to the page URL instead of a cookie. You enable cookieless anonymous identifiers ...
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