- One hand typing
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The idea of one hand typing is to only use one hand (e.g. the left one) and type typical the other hand (e.g. right-hand) letters. Its history and application are closely related to keyboard research on QWERTY and Dvorak Simplified Keyboard.
Type with one hand can be done in a number of ways, and novel approaches are still emerging. People handle this situation in different ways and the solution depends on whether it's a temporary condition, as well as the pupil's physical abilities, muscle strength, cognition and memory, etc. Therefore existing approaches may fit different expectations.
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Benefits and Drawbacks
"One hand typing while another hand holding a cup of coffee" is sometimes desirable by many typist. It can be useful during very frequent switching between keyboard and mouse or if the typist makes notes while using one hand for other task. However, often one-handed keyboard typing is rather slow and as only one hand is being used it can also be quite tiring.
Using Standard PC Keyboard
Spacebar as Modifier
The idea is to only use one hand (preferably the left one) and type typical right-hand letters by holding the space key with your thumb which then mirrors the right side to the left one. Thus you're using the same finger on the left hand which you would use on the right hand to type that key.
There are several hardware and software available, e.g. Half Keyboard, and a free Autohotkey script half-QWERTY.
Hand homeposition on FGHJ
Using a standard keyboard, the one-handed typist must move from side to side to cover all the keys. Ideally, this typist should keep his (good) hand on fghj, a new "home" position in the center of the board, but he will inevitably be forced to leave the home keys or stretch like a concert pianist to reach all the letters. Capital letters definitely require a time-consuming excursion to one side or the other. This reduces efficiency and frustrates the typist. A typical tutorial is available here.
Special Keyboard Layout
There are also some single hand keyboard layouts exist, such as "one hand Drovak" and "Left hand Ngaih". Switching the keyboard layout is often required. It is hence inconvenient for others to use the same computer.
Using Special Keyboard
Chorded Keyboard
Refer to Chorded Keyboard.
FrogPad or the like
Keyboard on a Concave Shell
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