Referrer search highlighting is when one goes to a search engine such as google or yahoo and performs a search that generates links to your pages. When you click on the link and this feature is active, TikiWIki notices that you have come from a search engine site and highlights the search words you used as if you had performed the search using TikiWIki's own search facility.
does google send the information along with the request? would be interesting to have more info on how this works. — nayjevin