Hidden Input

It does exactly what it sounds like: it allows for an input which is hidden from the user.

Why have hidden input?

The simple answer is

• to pass information to the CGI program which does not and should not change, but is for some reason important.
• Plenty of examples to come.

Hidden input is specified via hidden value to type attribute. For example:

   <INPUT type="hidden" name="sendTo" 
          value="dave@cs.cf.ac.uk">