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The first word you type into the search box is the search type and that controls which Web site you'll be searching on. Any successive words are the search term you'll be using. Hitting tab will complete the search type (or you can select with your mouse or just type it out) and then you just type the rest of your search and hit enter.
For example, typing 'books beginning perl', in the default configuration, will search amazon.com for books matching "beginning perl":
Searches not matching a known search type will use duckduckgo.com