Computex Taipei 2013 - We've seen many images of the Windows 8.1 Start Button surface over the last few weeks, which has led to much speculation on what it will actually do. Thanks to a recently surfaced video, we now know exactly what it does.
During a demo the company held at the 2013 Computex show in Taipei, Taiwan, Microsoft briefly showed off the new Start button. It appears that clicking the button will launch the Windows 8 Start Screen, but will launch it from within the desktop environment.
This frees the consumer from having to switch between the "Metro" UI and the desktop environment constantly to perform different tasks. A proper Start menu is still not present, but users will be able to launch desktop apps from the start screen without being forced to search for the apps.