• Constantly visit web sites to create "indices" or "databases" of pages; queries search the contents of these indices/databases, not the entire contents of the web itself.
  
  
• Each one indexes differently, relatively little overlap, features and strategies differ--expect to get different results from different tools.
  
  
• InfoPeople Project: Search Engines Quick Guide http://www.infopeople.org/src/guide.html
  
  
• Search Engine Watch http://www.searchenginewatch.com/

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