the programme needs only a joystick – that is frequently equipped on most modern wheelchairs – and the built-in microphone of a personal computer. It requires much less physical movement to operate when compared to a traditional mouse and keyboard, making it ideal for use by a disabled person. When building the software, he deliberately designed a “rolling character interface” which enables a user to quickly pick alphabets by applying a simple pre-recorded voice command (for example, pronouncing the sound “uh”). A user can also uses voice commands to represents a mouse action such as “double click”, “move the cursor” or “move the cursor to a designated mark on a computer screen”. The design enables the user to “type” accurately and efficiently with minimal motion.