Asus DSL-N12U (VER.B1) - Manual (Page 37)

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. Unplug the USB flash drive from your computer then insert it
to the other computer that you want to add to your wireless
network.
4. Locate SetupWireless.exe from the USB drive, and double-click
to run it. Click Yes to add the computer to the wireless network.
5. Click OK to exit the Wireless Network Setup Wizard.