Setting a Breakpoint and Using More Watches

A breakpoint is a symbol (point) you place in source code to indicate where you want a program to stop executing temporarily. When you run your code, Visual LISP proceeds normally until it encounters a breakpoint. At that point, Visual LISP suspends execution and waits for you to tell it what to do. It hasn't halted the program for good—it has placed it in a state of suspended animation.

While your program is suspended, you can

• Step through your code, function by function, or expression by expression.
• Resume normal execution of your program at any point.
• Alter the value of variables dynamically, and change the results of the program being executed.
• Add variables to the Watch window.