Forum Moderators: DixonJones
This is how most of the affiliate programs work, a cookie is created on the clients computer when they click their link. So if the user returns a year later (and they haven't deleted their cookies) that sale will still be referenced back to the orginal referrer. And they get the commission.
There are tracking services out that provide this and more but WW don't like you mentioning specifics!
I'm fairly certain the answer to your question is here, and it can be found in queries about cookies and/or tracking repeat visitors.
Be nice- if you find it can you post what thread you found it in?
:)