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Many computers do not have a way to disable the touch pad. Mine does not.
If you don't have a button or switch on the computer, and cannot disable it in the Control Panel, you might just cut a piece of thin cardboard and tape it over the touchpad.
It's not the most elegant solution, but it works.
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I'll bet this is my video you're thinking of. It does show how to disable the touchpad on my computer at the time, using the control panel.