Windows Server Update Services

Microsoft gives administrators full control over the update management process, eliminating the need for client computers to retrieve updates directly from Microsoft Update. WSUS administrators can specify the types of updates to download, create target groups of computers to receive updates, and determine which computers require updates before deployment. Administrators can approve updates for deployment automatically, uninstall updates, and generate reports to monitor update activity.

Go to http://msdn.microsoft.com/en-us/library/ms744624(VS.85).aspx