This article is from the Ergonomics and Typing Injury FAQ, by Dan Wallach firstname.lastname@example.org with numerous contributions by others.
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Mac and PC (but, not Windows)
Half-QWERTY is software that turns your standard keyboard into a
one-handed keyboard. Touch-typists can learn it with little or no
When you hold down the space bar, all the keys under your hand change to
those that would normally fall under the same fingers of your other hand.
The space bar is still used for typing spaces. It differentiates based on
the duration you hold it down.
When you're not holding down the space bar, you can use your keyboard as a
normal two-handed keyboard (maybe you want to switch from one to
two-handed typing depending on your task, i.e., whether you're using your