We describe here a two-way teleconferencing system 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. Léon-Bérard Center and Edouard-Herriot Hospital are 300 m apart. Elie-Vignal secondary school is 6 km from the first site; all three institutes are connected through 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. After school time, the system can also be used to organize games between children, or friendly contacts between children in each institute, children in the college, brothers, sisters or friends who may have access to one of those institutes. The system aims are: 1) to improve the education delivered to children and teenagers who spend long periods in hospital; 2) to establish a relationship between both worlds of healthy or sick children through teaching and playing in common; 3) finally, to facilitate the social insertion of sick children at leaving hospital.