what this mean and what is advantage of putting this in indicator ?

 

//#include <xDebug.mqh>

what this expression mean and what the advantage to put it in mql4 program  ?

as am new and trying to learn

thanks 

 
You can read everything you want to know in the editors reference!
 
gooly:
You can read everything you want to know in the editors reference!
and can you please guide why getting dlls error here on screen ?
 
I don't see any dll!
Reason: