The common way to accomplish this task is to use the WiFi switch on your notebook computer to turn on and off the radio receiver in your notebook. On many laptops there is a physical switch on the side, front, or keyboard-surface (often at the top above the keyboard and many have LED lights such as Amber, Blue, or White color). If you turn the WiFi switch to the disable position, many notebook models will actually show this in RED, ORANGE, or GREEN lettering right on your windows desktop display to tell you which position your phsyical switch is in. If you disable the WiFi switch, your built-in LAN adapter will automatically connect it to the router you have the ethernet cable physically plugged into *your 2nd router and thus 2nd...