Ambidexterity is the ability of being equally adept with each hand (or, to a limited degree, feet). See laterality. The word "ambidextrous" is derived from the Latin *ambi meaning "same" and the root *dext meaning "right"; thus, "ambidextrous" is literally "right on both sides".
While ambidexterity can be learned, most people still gravitate towards performing certain types of tasks with a specific hand. The degree of versatility with each hand is generally the qualitative factor in determining a person's ambidexterity.
In modern times, it is more likely to find people considered ambidextrous who were originally left handed, and learned to be ambidextrous either deliberately or during childhood by indoctrination through institutions such as schools where right-handed habits are often emphasized.
Even so, I use this ambidextrous method of sharpening my chainsaw, and can sharpen the chain in 10 minutes or less without removing the chain from the saw, while using only a chainsaw file and a homemade stand.
When the tooth is finished, the entire cutting edge will be straight, parallel to the scribed line, and sharp enough to peel a chip off the top of your fingernail.
Now comes the ambidextrous part: When the left-upward sloping teeth are finished, it is time to repeat the process for the right-upward sloping teeth.
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