In this section, a discussion of the functionality of the MPI based subroutines used in the parallel codes, ELECFEM3D_MPI.f, ELAS3D_MPI.f and THERMAL3D_MPI.f are presented. Since each program will have its own specific needs, the operations will be essentially identical except for the dimensionality of the operand in question. See Table 1 for the variations in dimensionalities.