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CheckVisitorStatus is used to get user's IP address and check whether a user has already been voted. The method uses ipBlocking property which is publicly exposed and you can use it programmatically or through PollBox's ControlDesigner properties. By default ipBlocking is set to true which means that an user can vote only one time until you release the IP address.
Just to let you know all modules from Sitefinity 4.0 will be Generic Content based and we will try to make more methods public so that users can access and override them.
the Telerik team