Use touch-screen, PDA, iPhone, Motorola Droid or Motorola Milestone with a prosthetic hand
Using a prosthetic hand or hook, using inductive touch screens can be a big problem. As modern electronics are attractive in many ways and as particularly disabled people often need a better and much more thorough basis for planning and information for a range of individual reasons, modern PDAs, iPhones or other touch screen devices are attractive.
As can be shown such a pen will actually work with a prosthesis - hook or hand.
Here are some links to pens that may do the trick.