Group Policy, in part, controls what users can and cannot do on a computer system: for example, to enforce a password complexity policy that prevents users from choosing an overly simple password, to allow or prevent unidentified users from remote computers to connect to a network share, to block access to the Windows Task Manager or to restrict access to certain folders. A set of such configurations is called a Group Policy Object (GPO).
As part of Microsoft's IntelliMirror technologies, Group Policy aims to reduce the cost of supporting users. IntelliMirror technologies relate to the management of disconnected machines or roaming users and include roaming user profiles, folder redirection, and offline files.
To accomplish the goal of central management of a group of computers, machines should receive and enforce GPOs. A GPO that resides on a single machine only applies to that computer. To apply a GPO to a group of computers, Group Policy relies on Active Directory (or on third-party products like ZENworks Desktop Management) for distribution. Active Directory can distribute GPOs to computers which belong to a Windows domain.
By default, Microsoft Windows refreshes its policy settings every 90 minutes with a random 30 minutes offset. On Domain controllers, Microsoft Windows does so every five minutes. During the refresh, it discovers, fetches and applies all GPOs t