When you normally log in to your Windows NT, 2000 or XP computer after having provided your user name and password (aka the "credentials"), a so-called "desktop" is created for you by a system component (the winlogon.exe process) that acts as the surface for your user shell, the taskbar, and all windows you create by starting programs. For every logged in user, Windows creates this single desktop, that has the name "default" and is therefore often called the "default desktop". SUperior SU and its desktop switcher can create additional desktops for you and on each desktop that is created, a new taskbar and desktop background with links on it, etc. is created. The real cool thing is, that every desktop runs in the context of a user whose user name and password you provide prior to creation of the desktop.