Use centralized, contextual search - Windows 8

Search for anything in any app from one place.
The Search function located on the Charms bar is packed with power, letting you search the directories of not only your Windows 8 machine, but also the greater Windows ecosystem. Simply choose the bucket of data you want to sift through—it could be all your installed apps, your system settings, your files, your mail messages, or even an external service like the Windows Store or Bing Maps—type in a keyword, and hit Enter. The Search function will then return the results, perfectly contextualized for the database you’ve addressed
Oh, and how's this for cool? You don't even need to hit the Charms bar to access Search. From the Start screen, simply start typing, and you'll be quickly whisked to the text-entry field for search queries. Try it. It works!