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Do a google search for "captcha"
This one looks pretty easy to use... http://www.alagad.com/index.cfm/name-captcha
"Wally Kolcz" <firstname.lastname@example.org> wrote in message news:email@example.com...
>I have seen those randomly generated images that contain numbers and letter that you have to use to verfiy that you are a real
>person when signing up or submitting a form.
> Where can I find more information on those that work in coldfusion?