Once Seven Transformation Pack is installed, you'll be able to enjoy almost all the elements of the Windows 7 interface: the startup screen, the start menu, the visual styles, the toolbar, the sounds, the desktop and the icons. To manage all the latter, Seven Transformation Pack uses third party tools to recreate the features of Windows 7. It uses ViStar to emulate the start menu; True Transparency for the windows' transparency; Vista Rainbar to be able to include the desktop widgets and ViSplore for the address bar.
With Seven Transformation Pack you'll be able to keep on using Windows XP, but by means of a renovated interface that is much more modern and that is nearly identical to Windows 7. And if you get tired, you'll be able to uninstall Seven Transformation Pack and return to the previous interface.