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Windows 7: Connecting to wireless networks
If you have a laptop, you can see a list of available wireless networks, and then connect to one of those networks, no matter where you are. The wireless networks appear only if your computer has a wireless network adapter and driver installed and the adapter is enabled.
Whenever possible, you should connect to security-enabled wireless networks. If you do connect to a network that's not secure, be aware that someone with the right tools can see everything that you do, including the websites you visit, the documents you work on, and the user names and passwords that you use. Changing your network location to Public can help minimize the risk