The Sharing System Preference has Screen Sharing and Remote Management. Both control VNC. You can’t use one while using the other. So what’s the difference. Well, Screen Sharing, the new application in 10.5 doesn’t require that you purchase a copy of ARD if you only want to be able to control the screens of other Macs. If you enable Screen Sharing then your Mac will show up in the SideBar of other systems in your environment. Remote Management still works the same way it did in 10.4.