If the value of the ALLUSERS property does not equal 2, the Windows Installer ignores the value of the MSIINSTALLPERUSER property. To request that the Windows Installer install the dual-purpose package in the per-user installation context, the user can set the value of the MSIINSTALLPERUSER property to 1 and the value of the ALLUSERS property to 2 using an authored user interface or a command line. To request that the Windows Installer install the dual-purpose package in the per-machine installation context, the user can set the value of the MSIINSTALLPERUSER property to an empty string ('') and the value of the ALLUSERS property to 2 using an authored user interface or a command line. The value of MSIINSTALLPERUSER property is ignored when installing the package using Windows Installer 4.5 or earlier.

If the value of the ALLUSERS property does not equal 2, the value of the MSIINSTALLPERUSER property is ignored and has no effect on the installation. For information about authoring a dual-purpose package, see Single Package Authoring. To use the MSIINSTALLPERUSER property, the value of the ALLUSERS property must be 2 and the package has to have been authored to be capable of installation into either the per-user or a per-machine context.

The MSIINSTALLPERUSER and the ALLUSERS properties can be set by the user at installation time, through the user interface or on a command line, to request that the Windows Installer install a dual-purpose package for the current user or all users of the computer.

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