Firewire Networking

I seem to be posting a flurry of help threads these days, I'm about to go back to school and need to sort out a lot of computer issues it seems.

Anyways, I have an issue. My father has two Sony Viao laptops, each with 4 pin firewire connections. He is also on a wireless network in our house. We need to be able to connect the two computers via firewire (speed issue) so that he can update files and keep both computers in sync. A USB system we've used has worked, although since USB doesn't have a system like IP over Firewire, its a pain to use software for it.

We have the cable, and we've managed to connect the two computers through using shared folders. This system works, however there are some real issues with it. In particular, to share a file between the two computers also opens it up to everyone else on the network, which is too dangerous of a sacrifice to make. I'm wondering if there is any way to password protect the network connection or prevent it from appearing on the other network besides stopping the share.

Jam it back in, in the dark.

I was thinking of trying that, although it was something I was hoping to avoid. There's no way to do it in Windows eh?

There's nowhere I can't reach.