Some webs have cookies that let visitor know how many times they have visited, other cookies remember names... etc

does anyone know of a cookie that would let visitors know how many usernames they are using at the board...

Sort of to scare them into using only one... or so they think we know they are using more than one...

thanks

Yup JustDave's Multiple Identity Detector adds a cookie for each user, and will PM you when multiple users are detected on the same computer.