Thermoptim calculations are structured around projects. You can create a new project or open (load) an existing project. When you have defined the various elements of your project, you can save it by choosing "Save ..." or "Save as ...". The list of existing projects can be obtained by selecting "Project library". Double-clicking a row in the table of the project library, you can open the corresponding project. The list of existing examples can be obtained by selecting "Example catalog". Examples can be loaded and saved in your project directory.