In How to disable my netbook's touchpad when a usb mouse is connected I could not find an answer for my question.
Some laptops have drivers that automatically disable touchpad when an external mouse is connected. My three-years-old Toshiba's drivers do not have such option. Is there another way to do this in Windows 7? Answers to the mentioned question say to use the driver's option. I don't have that driver and thus don't have such option. What can I do?