Here is how I am set up:

Phone line to back of XP box and into modem
Cable from XP box ethernet card to Cayman router
Cable from 98SE box ethernet card to Cayman router
Cable from second 98SE box to router(possible non-functional ethernet card)

I know that this all sounds pretty simple but that is how I see it. I am able to share internet between the XP box and the first 98SE box but that is all. I can't actually see each machine on a network. I have checked the share level out on all boxes and they are all set to share on a network.

I hope that this clears thing up a little.
Mike