I have build a online questionnaire with 20 question. Each question is on it's own page with a "next" button which saves the answer along with the user id.

There are separate tables for every question.

At the end there are one page that shows a summarize of questions and answers.

Now, the client is asking if it possible to let the user leave off in the middle and continue at a later time. Can this be done? How to do it?

The only way to do that I can think of, is to use cookies. But that will - if I understand it right - only work if the user use the same computer the next time.

Any other way to manage this?

Regards, Magnus