The idea of one hand typing is to touch type using only one hand (e.g. the left one). Its history and application are closely related to keyboard research on QWERTY and Dvorak Simplified Keyboard.
Typing 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.