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You can find all this information from the owner of the Wi-Fi network, the IT administrator (if you are in a business environment) or from your wireless router if you are at home.
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If it is not using any security, you only need the SSID. If it is using WPA-PSK or WPA2-PSK, note the Pre-shared key. If the network uses WEP, note the WEP key.
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