4.2. Policy Application via Remote Access, Slow Links, and after Hibernation
You will certainly have situations in which users take their Windows machines on the road and remote-access your Active Directory and servers via dial-up or VPN.
All versions of Windows, by default, will detect the speed of the connection and make a snap judgment about whether to process Group Policy. However, different operating systems determine the speed differently.
4.2.1. Windows 2000 and Windows XP Group Policy via RAS Speed Determination and Policy Reapplication
If the Windows 2000 or Windows XP machine uses TCP/IP to connect to RAS (Remote Access Service) and the connection is 500 kilobits or greater, it is considered fast enough to process Group Policy.