Yesterday i went for an interview. There they asked.
"Suppose you have a registration form with no unique attribute for email or username. And a person tries fill the registration form again and again.How to keep the track of user weather he has already filled the form or not. You have to save all the data regarding the users "Even the unregistered one too" for the companies future use. How will you do it without using session and cookies ?"
Till now i have heard about these two methods only. Is there any other method or it was just a tricky one ?