Language of structural procedural programming Argus is a low-level language (assembler) intended for description of procedural component of applied parallel program for RCS and structural component in the form of commutations of unified macroprocessors or specialized circuit solutions. Language Argus is necessary for organization data flows on the level of instructions of distributed memory controllers and for development programs which use topological and architectural peculiarities of RCS base modules. For development using language Argus, like any other assembler, software developer has to have wide knowledge of RCS hardware, of instructions of distributed memory controllers and interconnections between system structural elements.