So you have a VPN Host in your main office, and you would like to have one more computer / network connected in. You will need to install WinGateVPN onto a Windows Computer that has a NAT connection method available; and since it will be a VPN Joiner then you should not need to open any holes in your firewall.
Whether you need to access the one computer only, or the local network is your decision.
To have the Local Network participating in the VPN you will need to have either one of the following setup:
1. Have the VPN Participants default gateways set to the local WinGate VPN computer.
2. Have the VPN Participants use the Qbik RIP2 Utility (not on the actual WinGate computer).
http://downloads.qbik.com/qbiknz2/downl ... client.zip
3. Turn on RIP2 on the VPN Participants default gateway (debian box?).