The paper reviews the main tasks that were being solved at the initial stage of the computer networks development, where the nodes were used for processing in real-time the radar data of the air defense moving objects. The difficulties, that arise in connection with the above mentioned, and the concept, adopted in the 1960s, of the real-time operating systems software design for the control of the data processing processes are described. The airborne objects radar data processing and transmission throughout the global air defense network system software architecture is provided.