IsTesting, HideTestIndicators : What do these mean ?

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I see these functons and I want to know how to use them ??

IsTesting, HideTestIndicators : What do these mean ?

What is a testing chart ? EA is running in testing mode, so what does this mean, if on a live account orders are not sent ??

Hide test indictors, where and how is this seen or not seen from the main chart ??? Please advise ?

 
Type it on the Metaeditor navigator and push enter button, you'll find this

void HideTestIndicators( bool hide)
The function sets a flag hiding indicators called by the Expert Advisor. After the expert has been tested and the appropriate chart opened, the flagged indicators will not be drawn in the testing chart. Every indicator called will first be flagged with the current hiding flag.
It must be noted that only those indicators can be drawn in the testing chart that are directly called from the expert under test.

Parameters:

hide - TRUE, if there is a need to hide indicators, or else FALSE.
Sample:
 
      HideTestIndicators(true);
   MaCurrent=iMA(NULL,0,56,0,MODE_EMA,PRICE_CLOSE,0);
   MaPrevious=iMA(NULL,0,56,0,MODE_EMA,PRICE_CLOSE,1);
   HideTestIndicators(false);
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