This software is an interactive program for the calculation of more than 25 thermophysical properties of water and steam based on the industrial formulation IAPWS-IF97. The software contains the possibility to calculate single states, whereas different combinations of input variables can be chosen. In addition, the program allows to calculate up to 33 diagram types for different properties, including the well known h-s, T-s, p-h and p-rho diagrams...