# Interface, Model and Equation Menus

This slot in the menu bar is occupied by one of three menus, depending upon the layer on which you are operating. On the Interface layer, you'll find the Interface menu. On the Map/Model layer, the menu reads Model. Finally, on the Equations layer, the menu reads Equations. You will note that the vast majority of items are identical in each menu, although as shown in Figure 3-14, specific items are unavailable on each layer. Note also that the Prefs entry, is specific to the level in question. Figure 3-14 provides links to the menu item topics.

Figure 3-14 Interface, Model, Equations Menus