20-sim is a modeling and simulation program that runs under Microsoft Windows. With 20-sim you can model and simulate the behavior of dynamic systems, such as electrical, mechanical and hydraulic systems or any combination of these.20-sim fully supports graphical modeling and gives you the possibility to analyze and design dynamic systems in a intuitive and user friendly way. 20-sim supports the use of components. This helps you to enter models as in an engineering scheme: by choosing components from the library and connecting them, your engineering scheme is actually built without entering a single line of math! Here are some key features of \"20sim Viewer\":