//+------------------------------------------------------------------+
//|                                                 ExternCommon.mqh |
//|                                  Copyright 2021, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+

// common variable(s) could be collected and defined here
int x; // 0 by default, could be with initialization - int x = ...;

//+------------------------------------------------------------------+