How can I make sure that each "PC" answers the survey only once?

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5 years 5 days ago #77008 by nups
Hello everyone,

I would like to find a way of making sure that the survey is only answered once per person asked.
I know this can be secured with entering a mail adress, but I don't know the Mail adresses, but the people asked will be informed via post. So is there any kind of technique in the background that secures every IP adress is doing the survey only once...or can I give out codes that can only be used once?

Thanks a lot for your help!

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5 years 5 days ago #77009 by nkorf
Just prepare an excel sheet with the tokens, upload them in limesurvey (with an empty email address) and use the mail merge function in word to create the individual invitations

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