I am not sure which of these you are asking about:
mom_pos - Defines the machine tool coordinates of the goto point (affected by kinematics.)
mom_mcs_goto - The tool path goto point as it would be output to a CLSF. The position is output with respect to current MCS programmed in the operation
mom_csys_matrix - Matrix that defines the mapping from the current local coordinate system to the main coordinate system. This matrix will be output with MOM_csys event only. The first nine elements will be a 3X3 matrix. The 10th through 12th elements represent the origin.
mom_msys_matrix - Matrix to locate the current MCS with respect to the Absolute Coordinate System.
mom_msys_origin - Defines the relationship between the current MCS (machine coordinate system) and the ACS (absolute coordinate system).