The ABL stack trace pane displays the ABL stack trace for the executing procedure. This pane indicates what procedure you are in and what procedure you came from. The top of the pane shows the top of the stack. You can investigate the code associated with a line of the stack trace by clicking on the stack trace line. The Debugger automatically updates the source code pane, variables pane, and watches pane to reflect the code and data associated with the selected stack trace line.