Hidden
A hidden format field allows information to be passed to the server without visibly appearing on the form. This could be, for example, a customer number or an order number. It should not be secret information however as it is visible in the HTML code. Hidden fields are often also used to carry information through on a multi-page form. Note that you can use the TerraForm attribute PassthroughFieldList to make this easier.
TerraForm recognises no special fields for hidden format.
