In document based applications, the Mac OS X Title Bar Icon is more functional than it appears. You can right click on the icon to view the directory structure the document is located in, which gives you quick access to its location in Finder. Or you can simply drag the icon to manipulate the file. You can drag it to your desktop (to make an alias), drag into an email (to add an attachment) or drag and drop it into a Terminal window (to add the full file name).