Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Mode
PH_SCENE_CAL_POS_MODE
Parameter: Frame
PH_SCENE_CAL_POS_FRAME_NUM
Parameter: P.X
PH_SCENE_CAL_POS_X_COORD
Parameter: P.Y
PH_SCENE_CAL_POS_Y_COORD
Parameter: P.Z
PH_SCENE_CAL_POS_Z_COORD
Parameter: Target
PH_SCENE_CAL_POS_TARGET_0
Parameter: Update Calibration
PH_SCENE_CAL_POS_FORCE_EXPORT