WinSteam provides accurate thermodynamic and transport properties of steam and water for Windows applications using the new IAPWS-IF97 formulations. WinSteam also allows you to select the IFC 1967 formulations for compatibility with older projects. The steam property functions can be used directly from within applications including Microsoft Excel, Lotus 1-2-3 and MathSoft Mathcad. Add-ins attach the functions so that you can use them as if they were built in to the applications. Programmers can call the WinSteam functions from Visual Basic or Visual C++. WinSteam also includes the stand-alone product DeskTop Steam, an advanced steam property calculator.