How yahoo spiders work?

Anyone knows how yahoo spiders work? In which base it ranks the websites?

If I started working for yahoo search engine, what are the main things do I need to consider?

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I am pretty sure Bing calculates website PageRank similar to the way Google does. It takes backlinks into consideration.

Rankings.
Content on the web page is scanned for word frequency, which are then reduced to their roots (ranking -> rank). Content is then ranked by relevance to the search term.

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