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By default, the Search menu includes every Metro app on the list, giving you the option to point a search to an app. So you can enter a term, click Internet Explorer, and have the query sent to your default search engine (Bing, unless you change it).
Because the Windows 8 Developer Preview ships with a large number of search-enabled apps, that initial search list is very cluttered. So clean it up as I've done here. Click Control Panel on the Start screen, choose Search, and then adjust the entries on the Apps list: move the slider to Off for apps you don't want to use for searches. Slide it to On for apps that you want on the list.