I understood the 
    Equity() command to act as a builtin Backtest.
     
    Accoringly, I 
    create the following simple code to create and plot the 
    Equity.
     
    
    E5    
    =  EMA(C,5);
    E45   
    =  EMA(C,45);
    
    Buy   
    =  Cross(E5,E45);
    Sell  
    =  Cross(E45,E5);
    PlotShapes(Buy*shapeUpArrow,colorGreen);
    PlotShapes(Sell*shapeDownArrow,colorRed);
    Eq    
    =  Equity();
    
    Plot(Eq,"Equity",colorBlue,styleLine);
 
     
    I loaded this 
    into the Indicator Bulder, and applied it and got my Equity plot.  No 
    other steps required.
     
    I shared the 
    code with a friend.  He did the same thing, applied it, and got an 
    {Empty} array and no plot.
    He loaded the 
    code into the AA window, clicked Backtest, and the plot of Equity 
    appeared.
     
    Question:  
    why did the same code act differently?  Next, will it be necessary to 
    run the backtest every day to update the Equity curve?
     
    Insights and 
    suggestions will be appreciated.
     
    Thanks,
     
    Ken