SENSwitcher is a suite of programs designed to help teach early ICT
skills to people with profound and multiple learning difficulties, those
who need to develop skills with assistive input devices and very young
children new to computers. It is, we believe the first time anyone
anywhere has developed an online switch enabled application which
targets ICT skills from purely experiential through cause and effect,
switch building, timed activation, targeting and row scanning.
http://www.northerngrid.org/sen/intro.htm