The Windows administrative method for controlling settings on client PCs using Windows 2000 or higher. 1?

Administrators use Group Policy to specify options for managed configurations for groups of computers and users. Group Policy includes options for registry-based policy settings, security settings, software installation, scripts, folder redirection, Remote Installation Services, and InternetExplorer maintenance.

Normally applied to an OrganisationalUnit in ActiveDirectory.

Microsoft's white paper on Group Policy

1? Part of something Microsoft descrives as !IntelliMirror? with very little explanation of what !IntelliMirror? actually is.