// Snippet 1: create the custom symbol and copy the source symbol's trading settings (TF_Engine.mqh)
bool CTFEngine::SetupSymbol(CTFResult &res)
  {
   bool custom;
   bool exists = TF_SymbolExists(m_job.name, custom);
   if(exists && !custom) { res.err = "'" + m_job.name + "' is a real broker symbol - choose another name"; return false; }
   if(exists)
     {
      CustomRatesDelete(m_job.name, 0, LONG_MAX);
      CustomTicksDelete(m_job.name, 0, LONG_MAX);
     }
   else if(!CustomSymbolCreate(m_job.name, "Tick Forge", m_job.src))
     { res.err = StringFormat("CustomSymbolCreate failed (err %d)", GetLastError()); return false; }
   SymbolSelect(m_job.name, true);

   // trading permissions follow the source, so an Expert's orders are accepted exactly as on the real symbol
   const ENUM_SYMBOL_INFO_INTEGER props[] = {SYMBOL_FILLING_MODE, SYMBOL_ORDER_MODE, SYMBOL_EXPIRATION_MODE, SYMBOL_TRADE_EXEMODE, SYMBOL_TRADE_MODE};
   for(int k = 0; k < ArraySize(props); k++)
      CustomSymbolSetInteger(m_job.name, props[k], SymbolInfoInteger(m_job.src, props[k]));

   // sample the price factor across the range to size the digits
  }