Changes

and

''HKCU\Software\Microsoft\Active Setup\Installed Components\%APPNAME%''

are compared, and if the HKCU registry entries don't exist, or the version number of HKCU is less than HKLM, then the specified application is executed for the current user. If your application requires installation of components such as files or registry keys on a per-user basis, but your application has no advertised entry points or other triggers to initiate the installation process, then '''Active Setup''' is the possible solution.