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Here is small freeware utility USBDeview which lists all USB devices that are currently connected to your computer. USBDeview displays Device name/description, device type, serial number also you can remove or disconnect USB devices that are currently connected to your computer.
Connecting to a phone or tablet with a USB cable. When you use App Inventor with a phone or tablet, that device communicates with the App Inventor software running in your computer's browser window. This communication is managed by the AI2 Companion App running on the device. The instructions below (step 2) explain how to install the companion.