What you are trying to do should be possible if the survey allows users to resume. Instead of the RespondentID, you'll want to include the ResponseID in the url when going back to Checkbox.
To see an example of what the URL used to resume the survey should look like, edit the survey permissions to allow users to resume, then edit the survey style to include the "Save and Quit" button. Next, test the survey and click the "Save and Quit" button and you'll see what the URL should look like.
-Noah
|