http://support.microsoft.com/kb/924160/

This WebCast summarizes the content in the "Network Access Protection (NAP) Platform Architecture" white paper at http://www.microsoft.com/technet/itsolutions/network/nap/naparch.mspx. This WebCast discusses the Network Access Protection (NAP) platform architecture in Microsoft Windows Server Code Name "Longhorn" and Windows Vista (both in beta testing at the time of this posting), the components of client architecture and of server architecture, and how NAP works for various enforcement methods.