The code display area occupies the majority of the space in the Source Debugger.

As its name implies, the code display area shows the source code for the currently selected modules. Selecting a module from the Module Tree displays the source code file containing that module, positioned at the line in the source file that contains the module code.
At the bottom of the code window appear a series of tabs that mark the source code files that you have viewed using the Source Debugger. A new tab is added each time you click on a module for viewing that is not in a source code file for which a tab exists. You may click any of these tabs to view the associated source code.
The Summary (Live) tab displays details about the live system (see Source Debugger: Summary (Live) Tab). If you are reviewing a crash dump, the label on the tab will change accordingly (see Source Debugger: Summary (Dump) Tab).
On the left side of the source code, the line number within the source file is displayed. Clicking on a line within the display highlights that line and selects it for the purposes of setting, enabling, or clearing a breakpoint.