Thank you that is useful.

One thing that isn't clear to me is where to add the custom indicators? in indicators.c file?

Also, in the same file most of the indicators call SETSERIES, as in example below:

// Awesome Oscillator
var AO(var* Data)
{
var R = SMA(Data,5)-SMA(Data,34);
SETSERIES(Data,34);
return R;
}

That is the reason I want too know what is the purpose of SETSERIES function?