Controlling program execution Information on using the debugger. Start the Debugger To launch the Debugger right-click on a program node and select Debug. Start the Debugger on a running program You can debug a running program. Stop the Debugger What happens when you stop a debug session depends on how the debug session was started. Step through the program Use the Graphical Debugger to step through your program. Breakpoints A breakpoint is a signal that tells the debugger to pause the program. A breakpoint displays as a red dot beside the corresponding code line. Watchpoints A watchpoint is a signal that tells the debugger to pause the program when the value of an expression changes. Debugger (fgldb) command prompt The Graphical Debugger also provides a command line interface. Once you have started a debug session, you can enter fgldb commands directly into the fgldb Command view.