By setting line breakpoints, you can stop program execution at the line number you select. You can only set breakpoints on lines containing executable statements. If there is more than one executable statement on a line, the program will only stop once before executing the first statement.
In CL,
setting breakpoints on consecutive lines will not always stop the program
multiple times, because some statements are mapped to the same line number,
such as statements that span multiple lines or DO ENDDO combinations.