As previously mentioned in Section 3.2, for all menus and input options, there are ? buttons that launch situational help pages for the particular input/option/setting you are trying to use. This includes information on “What is it” and “How to use it”, among other items. You will notice that many of the buttons underneath the main list boxes (Conceptual Model Tools, Simulation Tools, etc.) which launch submenus (e.g., Zones, or Lines) have an option called Help. Clicking on these Help options will launch a Real-time Help Page with instructions for how to use the menu / button palette.