Tired of dealing with a "flying curser" while typing a document? This happens when your thumbs drag across the touchpad as you type sending the curser to a different part of the document - sometimes several lines away from where you were typing.
Even if you use the touchpad for everything else, the "flying curser" will drive you bonkers while typing a document.
If you use a USB mouse instead of the touchpad, a way to disable the touchpad is even more important.
Here is how to accopmplish it on a Toshiba: press two function keys simultaneously - the FN and F9 keys.
To restore use of the touchpad press the same two keys simultaneously.
(FN is next to the CTRL key on the lower left of keyboard)