Can we prevent people from voting repeatedly? Can we be sure only authorised people vote?
If you use the recommended high security setting each person votes with a personal sign-in name and password called a voting account. It means the vote integrity does not depend on cookies or the IP address of the voter. People can vote from anywhere yet, if they attempt to vote again in the same poll, even from a different location, the repeat vote is blocked. However you can choose to let people vote repeatedly or a set number of times and still this will not corrupt the vote. This is because only the last vote from each person is counted in each poll. It means you can run continuous polls which can be relied upon.