Abstract: A hand mounted keyboard, having a pair of opposed keypads for receiving the fingers of the mounting hand between, the opposed keypads operable by opposed movements of those fingers. The keyboard also has a thumb operated keypad mounted on the exterior of the keyboard. The characters and functions are grouped into generally task related modes or lanes. The lanes are divided into blocks, each block having two rows of data, each of the rows corresponding to one of the opposed keypads. The lanes are chosen by activating a first key with the thumb, and a second key with the finger. The thumb operated key is activated to chose a relationship for mapping between blocks of data in each lane and the finger operated keys. The mapping relationships assign characters and functions by row and column to opposed keypads and fingers respectively.