I created a new survey and set one of the custom field's visibility to "Hidden". Now I am trying to set that form field to the hash value from the url like this: mydomain.com/surveys/rs261t5r1x8ac#valueineedtoset. I have looked at the apps/frontend/controllers/SurveyController.php but I don't see how it is possible to add the value from there. I have also looked through several other source files and I have not been able to find where the sql table gets updated so I can do this. Any help or pointers in the right direction would be greatly appreciated.