Set Breakpoint: Sets a breakpoint at the currently highlighted line.
Clear Current Breakpoint: Clears the current breakpoint (whether it is currently displayed in the main window or not).
Clear All Breakpoint: Clears all breakpoints.
Show Breakpoints: Shows a list of all currently set breakpoints. A highlighted breakpoint can be deleted by clicking the Delete button. Double clicking on a highlighted breakpoint will display that breakpoint's program listing in the main window.