A hub can be used to connect multiple computers and networks.
Assuming you're running Windows, click the start button, and then search for "Device Manager" (or open CMD or PowerShell and type devmgmt.msc). Look at the list of devices. If Bluetooth is there, you have it; if it's not there, you don't.
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Sometimes you will tell the CPU to use the main memory, secondary memory, network, or the input/output devices. Digital Computing: It's All ...