Thank you very much for the welcome and sharing this info.
It does help understand the hidden variable part. This is about identifying specific survey takers,
Another part I suspect his easier and maybe a simple feature, which is the ability to redirect I said they take her to a different URL based on either one answer to 1 closed-end question or a more complex situations based on their responses two more than one fixed Choice question. Sometimes it is called redirection on completion and is often found in the logic section, Example if this condition is met and this condition is met then disqualified the candidate and send to a specific URL. Is this possible?