Question:
Does the fact that Plug and Play Scada support TCP/IP mean that it also supports VPN?

Answer:
No it does not mean that we support VPN. VPN hardware is expensive and will require some development. Plug and play Scada can be made to support VPN, but please note that there will be an additional charge for development.
We recommend that our corporate clients rather get their own server that can reside on their private network. Some corporate clients prefer an active etherpads connecting out to pnpscada on the internet from behind a firewall.