Does MetaTrader have a debugger?

 
May be this question is stupid but I've found no answer in all helps. The question is because there is a menu point Add breakpoint. But I've not understand how can I use these breakpoints. If I've just add a breakpoint in MetaEditor and then run the script from MetaTrader the breakpoint makes no effect. To run a program any other way I don't know how and no help about breakpoints I've found. Tell me please how to use them and is it possible to trace a script by steps.
 
No. There is not Debugger in MetaTrader 4 .