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The right-most button displays your Chrome OS applications. These, as you'd expect, are the same Web applications you'd use in your Chrome Web browser.
Unlike earlier versions of Chrome OS, it's now easy to open multiple browser windows at once for those times you want to say quickly copy and paste between GMail and a Google document.
Here, for example, is an early start at this story in Google Docs. Spreadsheets, presentations, financial managment, contact management, and all the rest of the office software staples are available either from Google or other cloud software vendors.