You will have to configure the Win2KPro machines to connect using Dial-Up Networking. I did this recently, and it was easy (using RRAS to connect to my domain, and wanted the domain policies to be pushed to the callers).
Log into the Win2KPro machine(s).
Create a dial-up connection to your office like normal.
Log out of the Win2KPro machine(s).
Press CTRL+ALT+DEL to bring up the logon screen.
Have the user enter their normal domain user name and password in the boxes.
Click the Options button to exposes the domain drop-down. Make sure your domain is listed.
Click the checkbox next to Use Dial-Up Networking.
Click OK.
At that point, a new drop-down window comes up, where you can select the appropriate Dial-Up Connection. It will only display the Connections you have already built on the machine; that is why I had you make the Connection first.
Select the one you made to connect to your office.
The user name and password will AUTOMATICALLY be pulled from the normal Windows login/password box and put into the Dial-Up Networking box.
Have the user click Connect.
The Win2KPro machine will dial up to your RRAS server, and attempt to autheticate based off the user name and password. If that is right (and if the user has dial-in rights), then their dial-up connection will be established.
At that point, the user is connected to your network, and the normal domain controller authentication will happen, just like if the user were plugged into the switch.
Authenticationwill happen, then the GPO will be pushed down the phone line onto the remote system.
Basically, the user connects to the office via phone line, instead of through a NIC and CAT5 cable. But as far as Windows is concerned, it is the same. GPO is applied, logon scripts run, drives map, and all is well.
hope this helps