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You will need the SSID (network name). This is typically broadcast so you can scan for it and select it. In some rare cases, the SSID is not broadcast.
If you are in an area with a lot of networks, you can unplug your wireless and see which one goes away if you are unsure.
You will also need the network passphrase if it is encrypted.
Sometimes the TF's get confused in the handshake and a router reboot helps fix the issues.