I have a Desktop hooked up to comcast internet through Motorola cable modem . Will the internet work if I unplug the desktop from the cable modem and plug in a laptop or is there some kind of setup I need to do with laptop. Also would the IP address be the same or would a different IP address be established for the laptop. and one more question why is it when the computer is not online it doesn't show the IP address. Is the IP address not on the computer?