Here's our Tip for.. October 8, 2007
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Improve Your Network
There are two types of wireless networks known to Vista: public and private. Public networks are less secure, so the OS disables discovery of other devices when connected to one. But by default, Vista makes your network public. Go private instead, enabling a much more comprehensive view of the network behind your router using a new protocol called Link Layer Topology Discovery.

In the Network and Sharing Center, click Customize under the picture of your network at top. Switch to Private and click Next. While you're optimizing things, note the various sharing options listed; it's easy to give all of your PCs access to your printer here.