Quote:
Originally Posted by Raccoon
please tell us more about the supplemental index 
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Google has toned down references to the supplemental index recently, but I think it still exists. Back when Google and MSN were competing to have the largest number of indexes, they would have found that large databases made for long search times and high maintenance bandwidth. I suspect this is why Google sprouted a second index. Since it wasn't indexed as often, pages that ended up there tended to stay there. These supplemental pages would also tend to drag other pages in by association. As a result, it was often called
"Google hell".
Pages in this index would be shown if no pages in the main index matched the search.