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Do you have a laptop with a touchpad?
When you type do you occasionally tap the touchpad causing your cursor to jump and start typing somewhere else on the page?
There is a very simple solution to this problem.
Just add the following line to /etc/rc.d/boot.local:
syndaemon -i 1 -d -t -K
This disables the tap-to-click and scrolling options automatically after a main key-press (excluding ctrl, shift, etc.) and re-enables these options after a 1 second delay. The pointer move and actual touchpad buttons are unaffected.
There a nice description the syndeamon and many other methods possible at:
https://help.ubuntu.com/community/SynapticsTouchpad