When a breakpoint is triggered, the debugger takes the following
    actions:

    1. Suspends program execution at the breakpoint location.

    2. If you specified /AFTER when you set the breakpoint, checks
       the AFTER count. If the specified number of counts has not
       been reached, execution resumes and the debugger does not do
       the remaining steps.

    3. Evaluates the expression in a WHEN clause, if you specified
       one when you set the breakpoint. If the value of the
       expression is false, execution resumes and the debugger does
       not do the remaining steps.

    4. Reports that execution has reached the breakpoint location by
       issuing a "break . . . " message, unless you specified /SILENT.

    5. Displays the line of source code at which execution is
       suspended, unless you specified /NOSOURCE or /SILENT when
       you set the breakpoint or unless you previously entered SET
       STEP NOSOURCE.

    6. Executes the commands in a DO clause, if you specified one
       when you set the breakpoint. If the DO clause contains a GO
       command, execution continues and the debugger does not perform
       the next step.

    7. Issues the prompt.

    You set a breakpoint at a particular location in your program
    by specifying an address expression with the SET BREAK command.
    You set a breakpoint on consecutive source lines, classes of
    instructions, or events by specifying a qualifier with the SET
    BREAK command. Generally, you must specify either an address
    expression or a qualifier, but not both. Exceptions are /EVENT
    and /RETURN.

    The /LINE qualifier sets a breakpoint on each line of source
    code.

    The following qualifiers set breakpoints on classes of
    instructions. Using these qualifiers with /LINE causes the
    debugger to trace every instruction of your program as it
    executes and thus significantly slows down execution:

       /BRANCH
       /CALL
       /INSTRUCTION
       /RETURN

    The following qualifiers affect what happens at a routine call:

       /INTO
       /OVER
       /[NO]SHARE
       /[NO]SYSTEM