Forum OpenACS Q&A: Response to P3P Standard and IE 6.0

The default setting in IE 6 allows a "first-party" cookie to be set, meaning that if a person visits Yahoo the browser will accept a cookie from Yahoo.

However, "third-party" cookies--most often set by marketers or ad networks to track consumer response to promotions--will be allowed through IE 6 default settings only if the third party allows consumers to opt out of data-collection practices. If the company doesn't give consumers an option, the cookie will be blocked.