Mud adminstrators cannot know for sure if you are multiplaying or not, but they can tell if you're connecting from the same IP address as other players. Some will act on that alone, blissfully ignorant of the fact that they're banning people for connecting from the same university or public library. Others will investigate further by monitoring your activities, trying to see if the suspect characters appear to be acting independantly or not.
A player who really wishes to multiplay will do so from multiple IP addresses, so this sort of heavy-handed "enforcement" does little to discourage the real problem. It might catch out a few clueless or careless multiplayers, but the people who'll suffer the most are those who connect through the same gateway as other players. Getting banned isn't the most fun way to discover that someone else at your university plays the same mud as you...
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