* Store an anonymous Participant Number (PPN) with the data that is related to a certain participant. This participant number can for instance be the token that you use in Limesurvey. It must be unique to the participant and it must not contain information that you cannot give to the participant. It is ok if the PPN is just the participant serial number (1, 2, 3, ...) | * Store an anonymous Participant Number (PPN) with the data that is related to a certain participant. This participant number can for instance be the token that you use in Limesurvey. It must be unique to the participant and it must not contain information that you cannot give to the participant. It is ok if the PPN is just the participant serial number (1, 2, 3, ...) |