The commands in SMS are divided based on the types of data they operate on. The user switches between modules to access the different types of commands. Only one module is active at any given time. However, the data associated with a module (e.g. a 2D finite element mesh) is preserved when the user switches to a different module. Activating a module only changes the set of available tools and menu commands.
There are several ways to switch from one module to another. These include:
Select an entity in the project explorer. The module containing the active entity becomes active.
Right click on the project explorer and select the Switch Module command.
Click on the module icon in the module toolbar. This is displayed at the bottom of the project explorer by default.
(Note: Switching modules should not be confused with changing the current model inside of a module. When a new model is selected, the tools and menus may change, and the data will be converted as much as is possible. However, some data may be lost.)