UltraVNC

This is how I do it:

Install UltraVNC on a single computer in the domain manually. Define users with WinVNC.exe -defaultsettings, and password etc.

Run MSLogonACL.exe /e <filename>

Extract registry settings and ACL, and import it with these cmd's:
regedit /s <regfile>
MSLogonACL.exe" /i /o ...