cookie is probably too small, try session variables, hidden input controls, viewstate (if you are using ASP.NET), local XML stores with userData Behavior, seehttp://msdn.microsoft.com/workshop/author/behaviors/reference/behaviors/userdata.asp?frame=true
Introduction to Persistence
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/persistence/overview.asp
Introduction to Persistence
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/persistence/overview.asp
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