I have 3 computers at home.
Windows 7 on a Desktop
Windows Vista on a laptop
Windows XP on an older Desktop.
Windows 7 is connected by physical cable to a router that is wireless capable, (a 'wireless router').
Windows Vista's laptop has a wireless card already built into the laptop and that connects to the router.
Windows XP has a wireless USB adaptor connected, and that connects to the router.
The router is connected to the cable modem, so all computers have equal internet access.
All of my computers are connected to a Home Network. That means, if any two (or all three), are turned on, I can access all 'public' folders from all computers on any computer. Public means that the OS doesn't restrict sharing anyway, and that those folders are shared.
It works well for me apart from the usual head-banging to get it all set up.
Hope that helps.
Could you give me an example of how this feature can be utilized?