How does the Dell Inspiron E5420 turn off the touchpad?

The Dell Yue Ling E5420 can turn off the touchpad in two ways:

Use the shortcut key FN+F3 to quickly turn on or off the touchpad function. The premise is that the computer must be installed with FN hotkey driver.

Switch in the control panel: open the control panel, because the touchpad controls the mouse, so find the mouse option in the control panel and click the mouse. There is a device setting option in the opened mouse properties. Select the device settings bar and disable the touchpad if it is found. After successfully disabling, click the application, and you will find that the touchpad cannot be used. If you want to turn it on again, click Enable next to Disable, and click Apply directly after enabling successfully.

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