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<quote>
<strong>Allow multiple responses or update responses with one token?</strong>: Default: No . If you activate this setting the participants may return to his survey by clicking the invitation link, even if he already submitted the survey. If survey is anonymous or Enable token-based response persistence is set to NO, this adds a new responses. If survey is not anonymous and Enable token-based response persistence is Yes, user update existing responses.</quote>
https://manual.limesurvey.org/Survey_settings#Tokens |
