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You can only connect one device at a time to the modem, so you can use only the ethernet port or the USB slot. You must power down the modem when changing the wires over, and the not in use computer must be completely unplugged.
Your best option if you want to use both PC and lappy together is to get a router - wired ones are available, and you can get USB adaptors to plug onto the end of an ethernet cable if the lappy doesnt have ethernet.
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