If neither a mouse or trackball is accessible to a student, an electronic head pointing device with an on-screen keyboard may work better. Or, consider using voice-input technology . If all keyboards and mouse-emulating devices are inaccessible to a student, consider the use of scanning software that allows the selection of characters or icons by simply hitting a switch . Word-prediction software might help. As the student begins to type, word choices are displayed from which the student can select.
Some text authoring software allows the selection of predefined phrases as well.