Open.- This command is to open an existing file. The program files exist as separate files with .sim filename extension.
Save the current work with the Save command before clicking the Open command. The program doesn't allow to open two files at the same time.
Save.- This command is to save an existing result.
The process of saving a file is carried out proportionally to the size in which the elements are drawn in the screen. Then, the saved file will depend on the screen format that we are using (for example, 1280x1024,…). If we try to read a file, saved in another different computer, we will have problems to open it.