The program package MONC for distributed computations by a Monte Carlo method The technique of distributed computations for Monte Carlo methods within a network of personal computers using the program system MONC is considered. The following subjects are discussed: a parallel modification of a congruent pseudorandom number generator; functional capabilities of the MONC; demands for a user’s program to execute using the MONC; an estimate of costs of distributed computations using the MONC. Advantages of the MONC are shown when solving diffusion problems