Services in Windows Vista also run in a less privileged account such as "Local Service" or "Network Service", instead of the "System" account. Previous versions of Windows ran system services in the same login session as the locally logged-in user (Session 0). In Windows Vista, Session 0 is now reserved for these services, and all interactive logins are done in other sessions. This is intended to help mitigate a class of exploits of the Windows message-passing system, known as Shatter attacks. The process hosting a service has only the privileges specified in the "RequiredPrivileges" registry value under "HKLM\System\CurrentControlSet\Services".