Function key is Fn key on keyboard.
these keys might be in orange color
with the help of these keys you can control sound volume. you can adjust screen resolution like brightness .you can also turn off/on wireless features.These keys are like shorcuts keys to perform few functions on your laptop.
To turn off your the finger pad
You can use the Mouse Properties window to disable the touch pad and track stick or adjust their settings.
Open the Control Panel, and then click Mouse. For information about the Control Panel, see Windows Help and Support Center <findinfo.htm>.
In the Mouse Properties window:
Click the Device Select tab to disable the touch pad and track stick.
Click the Touch Pad tab to adjust touch pad and track stick settings.
Click OK to save the settings and close the window.
Locate the "Fn" key in the lower right or left corner of the laptop keyboard.
The "Fn" key typically has different colored text on it or the key itself is a different color.
Locate the function (F1 through F12) key at the top of the keyboard that disables or enables the touchpad on the laptop.
The key typically has an icon that resembles a touchpad with a finger touching it or a touchpad with a diagonal line through it.
Press both the "Fn" and touchpad Function key simultaneously to reactive the touchpad on your laptop.
Move your finger along the touchpad to verify that it works.
Press the combination at any time to disable the touchpad again.
hope this helps
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