Shared computer toolkit from MS

Microsoft have released a beta of Shared Computer Toolkit for Windows XP that is suitable for computers in shared access such as libraries etc. It has features such as resetting the boot partition back to the administrator saved configuration each time the machine is rebooted (unless the administrator specifies that changes should be saved), Windows restrictions, policies etc. Looks like it could be handy (although I'd need another machine to try this out on). The local library had a copy of limewire installed on their desktop machine the other day that managed to persist after a reboot. Seeing as though this machine is *meant* to be locked down I'd like to know how that managed to get installed on the machine.