Dialog.H is based on the concept of optical signal transmission using cylindrical mirrors. The principle of the optical common bus and its communication method, the experimental system with a five-channel optical bus, and the system architecture are presented, and the feasibility of the proposed system is discussed. This optical bus has many advantages over conventional buses. In particular, signal transmission at 100 mhz clock frequency is possible using current-technology optoelectronic devices. Dialog.H is based on a virtual common memory. 7 references.