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//+------------------------------------------------------------------+
//|                                              changeSymbolAll.mq4 |
//|                                                                  |
//|                                                                  |
//+------------------------------------------------------------------+
#property show_inputs

extern string 	symbolToChange 		= "AUDCAD";
extern bool		changeAllWindows 	= false;
                   
int start()
{      
	long currChart,prevChart=ChartFirst();
	int i=0,limit=10;
	if(changeAllWindows)
	{
		//Print("ChartFirst =",ChartSymbol(prevChart)," ID =",prevChart);
		ChartSetSymbolPeriod(prevChart, symbolToChange, 0);
		while(i<limit)// We have certainly not more than 100 open charts
		{
			currChart=ChartNext(prevChart); // Get the new chart ID by using the previous chart ID
			if(currChart<0) break;          // Have reached the end of the chart list
			int period = ChartPeriod(currChart);
			//Print(i,ChartSymbol(currChart)," ID =",currChart);
			ChartSetSymbolPeriod(currChart, symbolToChange, period);
			prevChart=currChart;// let's save the current chart ID for the ChartNext()
			i++;// Do not forget to increase the counter
		}
		return(0);
	}
	else {ChartSetSymbolPeriod(prevChart, symbolToChange, 0);return(0);}
	
	return(0);
}