I share the belief that it is unethical however it is DONE by many. ... please comment I AM SURE other are interested .... As a result like many, I too would like to understand. If it involves a web site manipulating a visitors cookies, This would impact me and lessen my commissions because many (My audience) would not understand it exist. Any suggestion's what can be done to prevent this on my side? what are you doing? "please don't suggest it happens, yes I understand this" so your visitors come to your site with an existing stuffed cookie, what now? "yes I understand you loose the commission. But what can I do ?..... The type of question I am asking is ... Does cleaning cache, clean cookies ? Does cleaning your browser history clean cookies ? .... WORK...is this a solution, or the only solution? ... please explain ... how it happens?.... not just your personal belief and weather you do it or not ... I would, as others would like to know how to prevent it .... or what options are available .... What else can be done ?