Are you talking about internet access on a PC? If so, you are always using broadband when you connect to the internet. Wireless is a way of connecting your PC to the router without the need for wires between the PC and router.
Broadband is simply a system that allows you high speed access, compared to dial-up, to the internet. Your broadband connection goes via your telephone line to the router. You are using the wireless system of the router to transfer the internet connection to the individual PCs. When any PC in your network is connected to the internet, it is using the broadband connection.
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