>>>>What do you set in Condition. Can you give an example?
>>>
>>>Ctrl+Alt+B to bring up the Breakpoints window.
>>>Locate the breakpoint.
>>>Right-click, Condition...
>>>
>>>In the popup dialog box, select the option "Has changed".
>>
>>But that only checks if the value *has* changed at that specific line. Not the same thing as the ability to break *when* the value changes.
>
>
>You have to change the break location as well I think (am not at my computer).

But wherever you put the break that line has to execute in the course of normal execution. Only in C++ can you set a breakpoint to fire *when* a variable changes so that you can, for example, examine the stack to see what caused it.