What exactly are you trying to accomplish?So there is no way to get the two to communicate directly?
I gather you have multiple PCs in your house and they all use dial up? Correct? Well, you can run the internet set up wizard on your machine and configure it to share the dial up connection. Then you can have it dial out and connect to the ISP. Then network your machines, and run that wizard again and it will apply the network settings to share the connection from the machine that is already connected. So, all traffic is tunneled through the one machine that is connected. So, technically if a virus were to hit you while online (extremely rare, like winning the lottery rare with dial up) it would hit the machine that is connected to the internet first. Which would have your A/V software on it. Then the machines that are sharing the connection are technically behind it. Basically in a certain perspective you are setting up one dial up machine to act as a gateway for your other machines to connect to the internet. Mind you it will be extremely slow, but yes it is possible. This does require your machines to be networked.