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The only other option to cookies is to do it via a db, but this would be quite db intensive for a big site to store all the ip address' and the related info then recall it each time, but maybe if it was recalled to a session then this would be one / two additional requests per visitor, would it not.
If not db then it might have to be a flatfile method which could easily just fill a server up with additional text files, but this would have to be done outside of the websites folder as to remain secure so no-one can upload additional files or hack the server itself through the folder being writeable.
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