I'm pretty sure I understand what you want/need.
You're assigned one WAN IP address (what I believe you considered a "real" IP address) from your ISP. This is what you'll have to use to connect to any computer on your LAN. With your current setup, you can only connect to the server computer (the one with two NICs). With ICS, however, you should be able to do what's called port forwarding, so you can connect from the WAN (another computer on the internet) to your second computer (192.168.0.2). What you'll have to do for this, is configure the server computer's ICS.
Go into the Internet Connection's properties, and then choose the Advanced tab. The box for "Allow other network users to connect through theis computer's Internet connection" should already be checked, so go into "Settings." Then add a new service (name it something like WinVNC1, and then enter 192.168.0.2 in the IP address of the computer you want external access to. Then you need to share external and internal port 5800 for TCP (if you're using the web java client for WinVNC). If you're going to use the VNC Viewer, I believe you want to share port 5900 TCP. I can't guarantee these settings are all you'll need, as I'm just doing this from memory, but that's the basic process you need.
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