HELP! Route/Briding?

[Stik62]

Here is the scenerio. A XP pro dual NIC machine connected to a workgroup on segment "A" (NIC A) and a auto dial system on its own segment segment "B" (NIC B) (no wan access). I need remote access to the auto dial system (using a specified port) via segment "A" from the internet. I am not that familiar with routing and dont know if bridging can do what i need (I havent set up routes or bridges yet). The port has been forwarded in the router to NIC "A". I believe it should be forwarded to NIC "B" via a route or bridge, right? If so what method and how? If more info is needed let me know. Thanks!