The software is installed on computers that will be used to run the simulation. Install on as many machines as you’d like. The student purchases a serial number and creates an online account that allows them to use any computer with the software. You can even start work on one computer and complete it on another, since your work in the software is stored on our server and not on the computers you work on. So if your computer crashes, no work is lost because you can always access your account from another computer using your login and password.