) to open the Java Shell window where you can enter COMSOL API for Java® commands to interactively update the model tree. The Java Shell window appears in the Model Builder, Application Builder, and Model Manager workspaces, and you can also open it from the Run Code section of the Developer ribbon toolbar in the Model Builder and from the Debug section of the Method ribbon toolbar in the Application Builder.
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The Java Shell window is only available using the Windows® version of the COMSOL Desktop.
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) in the bottom toolbar, the list in the Unit System section of the root note changes from SI to MPa, for example. A tooltip also appears when you select a completion, with information about what that command does, what it returns, and possible completions when available. The progress of long runs that involve such progress information (meshing or solving, for example) can be followed in the status bar. If you need to stop a run, click the Stop button (
) You can right-click in the input area to access options to Go to Method (for a method from the Application Builder); Cut, Copy, Paste, and Delete; Select All; and Indent and Format. You can also choose Undo and Redo. For all these options, the regular keyboard shortcuts are available.
) in the bottom toolbar to make it possible to add and then run multiple lines of commands. Then press Enter to create a new line and press Ctrl+Enter to run the code. Press the up arrow or down arrow buttons or click the Previous in History (
) or Next in History (
) button to move up or down in the command history.
) to go to the node corresponding to the part of the model that the current output area output refers to. You can also right-click the output and choose Go to Node.
) to open the Data Viewer window where you can view the names and values (and also change values) of Java variables as well as model parameters and Application Builder declarations (this window is also available from the Windows menu and the Developer ribbon); see Viewing and Modifying Variables in the Data Viewer Window in the Application Builder Reference Manual for more information.
) and Expand All (
) buttons to collapse all or expand all content in the Java Shell window. 
) to only display the input commands in the output area. Click the Display Session Content button (
) to show the entire session content in the output area. You can right-click the Session Content line or press Delete to remove that session content from the output area. In general, you can press Delete or right-click and choose Delete on top-level nodes in the output area. Deleting such content does not affect underlying data. If you have clicked the Display Session Content button and then right-click a variable definition, for example, in the output area, you can then choose Delete from Session to remove that variable from the session. If you want to remove something from the model object, you need to use methods from the model API.
) to clear all content from the output area (no shell variables are removed, for example), or click the downward arrow next to the button to choose 
Clear Output Area. Use 
Reset Session to reset the session and clear the shell window, including shell variables. The Java Shell session is also reset when you open or start a new model. No content in the Java Shell window is saved between sessions. To make persistent changes, you need to change the model object and then save the model or use declarations in the Application Builder, for example.
icon) or return an error (with a 
icon), if the command included some syntax error, for example. The response in the output area includes the model nodes that were changed or created by the code that was run. You can select all tree content using Ctrl+A and deselect all with Ctrl+D.