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 for debugging tool
From The Free On-line Dictionary of Computing (30 December 2018) :

  debugging tool
      A tool used by a programmer to monitor
     and control a program he is trying to fix.  The most important
     functions of a debugger are tracing, stepping, breakpoints and
     Tracing displays a step-by-step report on what statement the
     program is currently executing, allowing the programmer to follow
     the flow of control through if statements, loops (loop),
     subroutine calls, etc.
     Breakpoints and watches both pause execution of the program
     and return control to the debugger under certain conditions.  A
     breakpoint triggers when execution reaches a particular
     statement in the program and a watch triggers whenever a
     specific variable is modified.  Stepping is like a breakpoint on
     every statement, often with the option to step "into" or "over" a
     subroutine, i.e. continue stepping through the statements of the
     subroutine or just execute it without pausing and resume stepping
     when it returns.
     Whenever control returns to the debugger it lets the programmer
     ask to see the values of variables, and possibly modify them,
     before resuming execution.  Some debuggers can be set to
     automatically perform some action like display a variable value
     and resume.
     A debugger can interact with the target program in different ways.
     Some debuggers require the program to be loaded into the debugger
     which may then modify or "instrument" the program for debugging.
     Others can "attach" to a program that is already running.  Some
     are built into the normal program execution environment (e.g. an
     interpreter) and can be set to run under certain conditions,
     e.g. errors.
     Early debuggers such as Unix's adb only knew about the
     compiled executable code so sometimes debugging had to be done at
     the level of machine code instructions and numerical memory
     locations.  If you were lucky, the debugger could access the
     program's symbol table and display the original names of
     subroutines and variables.  Sometimes this required the program to
     be "compiled for debugging".  Since compiling every program for
     debugging would add significantly to the size of a distribution
     of a whole operating system, it is common for programs to be
     distributed without debugging support but for individual programs
     to be made available with it.
     A major advance in debuggers was source-level debugging.  This
     gives the programmer a view of their source code annotated with
     breakpoints and a pointer to the statement currently being
     executed.  Such a view is commonly part of an integrated
     development environment like Visual Basic.

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