This program is described in Chapter 4. It checks whether the homogeneity of error variance assumption has been violated and conducts a test for moderation using analyses other than MMR when there is a violation of the assumption.
Source: Aguinis, H., Petersen, S. A., & Pierce, C. A. (1999). Appraisal of the homogeneity of error variance assumption and alternatives to multiple regression for estimating moderating effects of categorical variables. Organizational Research Methods, 2, 315-339.