Rules builder now allows the checking of a browser query parameter to conditionally format the form. However, what would be exceptionally valuable would to be able to set the value of a form field equal to the value of the browser query parameter. If this was possible, we could generate the URL to the NWC form with parameter (unique GUID) in SharePoint, send it out to a user, and then match the submitted form back up with the parent process in SharePoint. At the moment, rules only allow form fields to be set to a hard coded value.