Both these search engines check the links to build report and statistics. Till few years ago these two provide high rank to the sites with higher keyword density. Buy now it has been changed.
The procedure of position that yahoo and Bing are applying may be alike in code in comparison with the procedure of Google. There are of course some slight changes.
The whole thing about the search engines have just about parallel algorithm for indexing of web based sites with considerable variances. Yahoo indexing is grounded upon value of your web content.
Bing and Yahoo are now also check the links to reports and statistics, and the site in their ranks. A few years ago were very interested in providing the best sites have a higher keyword density, but the situation has changed.
The primary focus of yahoo is that the web site content quality. It doesn't highlight most of the relating to do-follow in addition as no-follow attributes.