By default the debugger tool appears as shown in Debugger tool below.
Figure 11.1 Debugger tool
The debugger tool has two areas, and a toolbar. These are described below. If you invoke the debugger tool by clicking Debug or Debug Snapshot in a notifier window, the tool also contains a listener pane. This provides you with a useful way of evaluating Common Lisp forms interactively in the context of the error.
The error condition can be operated on by commands in the Condition menu. See Performing operations on the error condition for details.
Double-clicking on any stack frame finds and displays the source code definition for that function in the Editor, if this is known. Any frame selected in this area can be operated on using the commands in the Frame menu, which is also available as the context menu. See Performing operations on stack frames for details.
You can choose which type of display it uses by the Frames and Arguments preference, described in Configuring the debugger tool.
When the Frames and Arguments preference has the value Tree-view , the Debugger appears as shown in Variables in the Debugger tree view below.
Each expandable root node in the Backtrace: tree represents a stack frame associated with a function call. You can operate on the frame as described in Backtrace area.
Expanding a stack frame node displays any variables associated with that function call. You can double click on any variable to inspect it using the Inspector tool. Any items selected in this area can be operated on using the commands in the Variables menu: see Performing operations on frame variables for details.
Each item in the Backtrace: list represents a stack frame associated with a function call. You can operate on the frame as described in Backtrace area.
A second list titled Local variables: shows the local variables of the frame which is selected in the Backtrace: list. You can operate on the variables similarly to the backtrace tree - double click on a variable to inspect it or use the commands in the Variables menu, which is also available as the context menu.
LispWorks IDE User Guide (Macintosh version) - 12 Feb 2015