Off the top of my head...Network shares are a wonderful thing & so is a secure VPN when you know both ends are secure. There's very big medical software/services company or 2 or 3 that learned some lessons about that this year. Say that in Russian for a good time.
Another fun way combines a click happy "invoice" recipient and those network shares. type //somenamedserveronthenetwork or//ipaddress for a good time and tell yourself, "It's OK, it's inside the firewall".