The installer begins searching for a source by checking the most recently used source location in the source list, then the list of network sources, then media sources, and finally URL sources. For more information, see Source Resiliency. If the search fails, the installer may present a Browse Dialog enabling the user to search for the source manually. The browse dialog box cannot be displayed if the user interface levels is set to None. An administrator controls the display of the browse dialog box to users by setting system policy.

With Windows Installer, nonadministrators by default cannot use the browse dialog box to locate managed application sources on media and cannot install managed applications. An administrator enables a nonadministrator to browse or install managed applications from media by using the AllowLockdownBrowse and AllowLockdownMedia policies. An administrator disables the capability to browse or install applications from media by using the DisAbleBrowse and DisAbleMedia policies.

The following table summarizes the use of these system policies in Windows Installer.

System Policy	NonAdministrator User NonManaged Application	NonAdministrator User Managed Application	Administrator Managed Application NonManaged Application
AllowLockdownBrowse	Users can install unmanaged applications using sources located on media. Users can browse media for the sources of unmanaged applications.	Users cannot install managed applications using sources located on media. Users can browse media for the sources of managed applications.	Administrators can install applications using sources located on media. Administrators can browse media for the sources of applications.
AllowLockdownMedia	Users can install unmanaged applications using sources located on media. Users can browse media for the sources of unmanaged applications.	Users can install managed applications using sources located on media. Users cannot browse media for the sources of managed applications.	Administrators can install applications using sources located on media. Administrators can browse media for the sources of applications.
Default	Users can install unmanaged applications using sources located on media. Users can browse media for the sources of unmanaged applications.	Users cannot install managed applications using sources located on media. Users cannot browse media for the sources of managed applications.	Administrators can install applications using sources located on media. Administrators can browse media for the sources of applications.
DisAbleBrowse	Users can install unmanaged applications using sources located on media. Users cannot browse media for the sources of unmanaged applications.	Users cannot install managed applications using sources located on media. Users cannot browse media for the sources of managed applications. .	Administrators can install applications using sources located on media. Administrators cannot browse media for the sources of applications.
DisAbleMedia	Users cannot install unmanaged applications using sources located on media. Users can browse media for the sources of unmanaged applications.	Users cannot install managed applications using sources located on media. Users cannot browse media for the sources of managed applications.	Administrators cannot install applications using sources located on media. Administrators can browse media for the sources of applications.

 

See Also

Source Resiliency

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Build date: 8/13/2009