One example would be a tool that you compile in and records some state after every LOC in a method which you are interested in. If you wanted to use a normal d

One example would be a tool that you compile in and records some state after every LOC in a method which you are interested in. If you wanted to use a normal debugger at the same time you would usually be shown your code with the tool's generated code mixed in. With this you could step through just your code.