This program is described in Chapter 7. It estimates the statistical power to detect a dichotomous moderator variable using moderated multiple regression (MMR). It computes power for specified conditions of effect size (i.e., absolute difference between subgroup correlation coefficients), total sample size, and sample sizes in moderator-based subgroups.
Source: Aguinis, H., Pierce, C. A., & Stone-Romero, E. F. (1994). Estimating the power to detect dichotomous moderators with moderated multiple regression. Educational and Psychological Measurement, 54, 690-692.