people who sit at PC workstations or visual display terminals in fast-paced, repetitive keystroke jobs can suffer a variety of health problems known collectively as cumulative trauma disorders. Their fingers, wrists, arms, necks, and backs may become so weak and painful that they cannot work. Many times strained muscles, back pain, and nerve damage may result. In particular, some computer workers may suffer from carpal tunnel syndrome, a painful, crippling ailment of the hand and wrist that, typically, requires surgery to cure.