Per Machine Installation if an application is installed on a machine all the users who log on to that machine can use the application, all users can see the shortcuts of that application. Per-Computer installation of an application means that the application is available for all users of a computer. It also means: Shortcuts are installed to the All Users profile. Windows XP Professional, Windows 2000, and Windows NT always require and run at administrative access privileges on the computer. Icons and transforms are stored in %WINDOWS%\Installer\{ProductCode}. ALLUSERS=1