I do not want to use a router.
For personal reasons, my wife and I use separate and independent Broadband internet connections.
We want to share the same printer. In the past, we used a Belkin printer switch. But now, I use Vista Business and she XP Pro.
The Belkin fails to "see" the Vista computer (even after downloading & installing an updated Beta version of their software driver).
Hence the problem. We now have to physically plug and unplug the printer USB printer cable for each of us to print. Not a very good solution.
I want to repeat: we do not want to share an Internet connection ... only the printer.