Google Quick Search Box (QSB) let you search for information from just about anywhere. As you type, suggestions will appear that match your query, ranging from applications and local files on your computer, to web search and navigational suggestions, to items from your browser history and contacts - and the types of results you can get will only grow over time! The quickest way to launch the Google Quick Search Box is by pushing Control + spacebar. QSB is extensible and you can create a plug-in to search over additional data or perform more actions on results. E.g. Twitter plug-in, after enabling, we can send tweets right from the QSB and then do a Google search right after!, explained Mac Blog.