Setting Source-Level Breakpoints
Typically, you set and clear breakpoints before you start a process. To set a source-level breakpoint, select a boxed line number in the Process Window. (A boxed line number indicates that the line is associated with executable code.) A icon lets you know that a breakpoint is set immediately before the source statement.
CLI: @ next to the line number denotes a breakpoint
You can also set a breakpoint while a process is running by selecting a boxed line number in the Process Window.
CLI: dbreak -- to set a breakpoint whenever the CLI displays a prompt