I'm sure you're all familiar with the Settings window. But you probably don't know that there are 2 types of Settings: global system-wide and local user-wide.
Interface tab of Settings and lower part of Log tab are local user-wide settings. It means different real users running ReHIPS Control Center can set different settings for them, for example use different GUI languages.
All other settings are global system-wide. It means they are set globally for all users.