Well, boolean searching is like any web search engine like Yahoo or Google. If you enter two different words like 'George Harrison' you might get 'George Michael' or 'Harrison Ford' as results, but if you type 'George +Harrison' then you'll only get results that include both words. When you search for 'BT' you'll get a lot of results for 'BTO' unless you type 'BT -BTO,' in which case it will exclude the results you don't want. Surrounding a phrase in quotes (") will make it search for exactly that phrase. So you can see that this would be the best tool for people who want to find rare stuff without having to scan through hundreds of results from a vague search. Really, you can't call it a search engine unless it includes these features.
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