 After the software is run, the program will simulate the interaction of the model's parts and can also graph the movement and force on any element in the project.It is useful for basic physics simulations, and can be quite a powerful dynamic geometric analytical tool, once you learn it.One drawback is that the basic commands like those for pulley and rope simulations appear to be limited to the 'string through a hole' type, but such limitations are quickly overtaken using the internal formula and scripting features of the software.