What alternatives to the mous are available?

Just like the other major input device, the keyboard, the mouse has its own alternatives to help students.  Trackballs come in a variety of sizes, and depending on their size, they can help students with a limited range of motion, or with poor fine motor coordination. Joysticks, with their moveable handle, can help students with issues of hand and finger control. Touch screen functionality can be integrated into the monitor or added later like with TouchWindow. Touch screens can help with many severe disabilities and autism. Head-pointing systems records head movements and translates them into mouse movements and can assist students with muscular dystrophy and spinal cord injuries. Eye-gaze systems turns translates eye movement into mouse movement and can assist students with muscular dystrophy, spinal muscular atrophy, and spinal cord injuries. Another technology not found in the text but worth mentioning is the Microsoft Kinect, which can serve as an input device by tracking body, eye and facial movements.