The development of the computer made human life more
comfortable. Using computers and the Internet has become a
part of our daily routine. People even use computers for
shopping and banking. People with severe disabilities such as
paralysis of their upper extremities cannot efficiently use
computer input devices such as a keyboard or a mouse;
meanwhile, the Internet is playing an important role in
preventing such users from being isolated from the society by
providing new information and serving as a communication
channel [1, 2]. The development of a computer GUI (graphic
user interface) that includes a touch screen and various
alternative input devices whose operation is based on
movements of the head or eyes has made it easier for users with
the abovementioned disability to use computer input devices.