Background: I have a close survey that is going to be filled using the same computer. The survey is anonymous and participants are given a token that they have to input at the beginning of the survey. Participants should be able to save midway, come back at a later time, enter their token and land on the survey screen where they left. If participant A closes the browser midway and leaves, and participant B comes to the same computer, the survey link should take participant B to the screen asking for the token.

Participants can only participate once, and their tokens are set with only one use allowed.

My survey has these settings:

•   Set cookie to prevent repeated participation = OFF
•   Participant may save and resume later = ON
•   Enable participant-based response persistence = ON
•   Allow multiple responses or update responses with one access code = OFF

Problem: When a participant stops taking the survey midway, pointing the browser to the survey URL with "/newtest/Y" added to it doesn't clear the session, which is needed for a different participant to start taking the survey from the token input screen.