Consider this: 2 sites separated by the internet. Both sites have a VPN firewall and a valid tunnel between them which is on full-time. Site A has SBS server/domain. Can Site B's users authenticate to the domain over the VPN connection when they log in to their local workstations? Said differently, can the folks at Site B's login experience be similar (identical?) to the users local to the SBS server/domain at Site A?