A 2-way teleconferencing system has been described which links the sterile and pediatric units of the Center for Cancer Treatment in Lyon to a secondary school and the pediatric unit of the University Hospital Edouard Herriot where primary teaching is given. The Léon Bérard Center and Edouard Herriot Hospital are 300 m apart. Elie Vignal secondary school is 6 km from the first site; all three establishments are connected via hyperfrequency aerials. With the help of this system, communication (voice and image) between children in hospital and pupils or teachers in school is instantaneous. Children in bed can listen to the lesson, break in on the conversation in school, ask questions or answer those of teachers and play with children in the classroom. The aims of the system are: 1) to improve the education delivered to children and teenagers who have to spend long periods in hospital; 2) to establish a relationship between the worlds of healthy and sick children through teaching and playing in common; 3) to facilitate the social insertion of sick children after leaving the hospital.