Mercurius is an internet search application for Windows that will help you to narrow down web searches by suggesting keywords and phrases you could use. If you have ever been daunted by the number of results returned by search engines, or found it difficult to think of the keywords to use to find something, then why not try Mercurius?
With Mercurius, you perform a preliminary search using your 'best guess' keywords, and then use any keywords suggested by Mercurius to make the search more specific. You can iterate the search as many times as necessary, using more specific keywords each time, narrowing it down until you find what you want.
For example, imagine doing a search on "William Shakespeare", which returns over a million results. From Mercurius' list of suggested keywords, you select "Ben Jonson" and "quote", and repeat the search. By thus narrowing your search to just a few hundred results, you quickly find Jonson's famous quote about Shakespeare being "not of an age, but for all time".