Carrying cookies from a page to a form

I have a page where I successfully set a cookie when an image is selected. When I shift to the next Form, I want to retrieve the value of the cookie named ProdID and drop it into a field by that name.

  1. which equivalent of a $$return field can I use behind the button to open the order form?

  2. Which Form event is best to get ProdID in? I’d like to do some simple lookups using the value of ProdID as the key.

Marcus