How to Configure Clickpad?

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http://askubuntu.com – I am running xubuntu 13.10 on a Lenovo ThinkPad X1 Carbon. It works very well, except the behaviour of my clickpad (touchpad where the buttons are built into the surface) makes it essentially unusable. The default behaviour means that the whole area of the clickpad moves the mouse cursor, so that when I try and click anything, the mouse will move around slightly and I will miss my target. After googling around, I saw suggestions suggesting that I should modify my /etc/X11/xorg.d/50-synaptics file (man) so that the AreaBottomEdge option is set to the height of the button area on my clickpad. (HowTos)