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The following screen....
... let you decide whether all users - or - just the current one - should be able to use List Fields. This question is targeted at those users that have to share a computer with other users.
If you select Install for all users, List Fields will be available to all users, and if you select Install for current user only, only the current user will be able to use List Fields. Even if other users may see the application files, they will not be able to run the application.
Behind the scenes this selection determine where some of the necessary registry keys should be placed. The all users option place the registry data at the so-called HKEY_LOCAL_MACHINE level, and thus makes the keys readable to all users. The current user option place the registry data at the HKEY_CURRENT_USER level, and thus ensure that only the current user has the correct setup for List Fields to run.
In Windows 2000 and XP the stronger security of the registry database ensure the security of the settings. In Windows 95, 98 and ME, the values will be readable to all users, and thus it may be possible to recreate the settings for unintended users.
Therefore, you should not regard this option as a real security measure.