Hidden items are essentially the same as open-ended questions, except that they read the values from query string, session, or cookie instead of a text input.
To display these items and allow a user to edit them, you would have to manually create a text box and populate it with the hidden item value. On postback, you would then update the hidden item (HiddenItem object) with the value of the textbox at the same times you call UpdateModel(...).
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