Computer technology has impacted the practice of medicine in dramatic ways. Imaging techniques provide non-evasive tools which alter the diagnostic pro- cess. Sophisticated monitoring equipment presents new levels of detail for both patient management and research. In most of these high technology applica- tions, the computer is embedded in the device; its presence is transparent to the user. There is also a growing number of applications in which the health care provider directly interacts with a computer. In many cases, these applications are limited to administrative functions, e.g.,...