A VPN connection is not warranted or supported by Microsoft, but Store Operations can work over ADSL or DSL broadband if you are using the same Internet company between locations. If you plan on using ISDN. use two channels if you can.
The POS module checks the time and date every second, so this limits its use over slow VPN Connections and may render the application unuseable.
Manager should work over most connections, but be forewarned that either RMS app can take up to 2 minutes to load initially. After that running Manager reports, etc. should be okay. POS will have problems if the connection is not consistent.
IMPORTANT: This configuration is not supported by the RMS license agreement. Support is not available if problems arise due to connectivity issues.