Professional DOC (PDOC) is a software environment for electronic documentation authoring and consulting based on the Hypermedia technology. It allows to manage different kinds of information (pictures, sounds, texts, graphics, video) organized according to hyperstructures. The user-friendliness and effectiveness of its man-machine interface, and its availability on the most common hardware platforms makes it a suitable product for a very broad category of users. INTERACTIVE DIAGNOSIS AND THERAPY is an electronic medical book designed to help general practitioners to make diagnosis and treat patients in their daily clinic practice.