[red]Hidden[/red] is just that, hidden. a simple value that gets past with the form. but is not visible to the user filling in the form.
It has nothing to do with the [blue]Submit[/blue] type, which is a button that sends the form to be processed.
In all practicality, [green]<input type=hidden[/green].... is equivalent to having an [green]<input type=text[/green]... that the user can't see and can't change the value of.
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.