Alone symbol

 
Ronco,

attach the EA on all symbols you want to trade or try to use the following code:

string symbols = { "GBPUSD", "EURUSD", ... }; // all symbols to trade
int pair = -1;
string tradeSymbol; // current symbol to trade
 
void start() {
 
   pair = (pair + 1) % ArraySize(symbols);
   
   tradeSymbol = symbols[pair]; // 1st tick: GBPUSD, 2nd tick: EURUSD, and so on ...
 
   ...
 
   if (...) {
      OrderSend(tradeSymbol, ...);
   }
   
   ...
} 
...
Reason: