string  TerminalInfoString(
   int  property_id      // identifier of a property
   );

//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//--- get OS and terminal data
   string os_ver  = TerminalInfoString(TERMINAL_OS_VERSION);      // user's OS
   string name    = TerminalInfoString(TERMINAL_NAME);            // terminal name
   string path    = TerminalInfoString(TERMINAL_PATH);            // folder the terminal is launched from
   string data    = TerminalInfoString(TERMINAL_DATA_PATH);       // folder for storing the terminal data
   string common  = TerminalInfoString(TERMINAL_COMMONDATA_PATH); // common folder for all client terminals installed on the computer

//--- send the obtained data to the journal
   PrintFormat("OS: %s\nTerminal: %s\n- Path: %s\n- Data path: %s\n- Common Data path: %s", os_ver, name, path, data, common);
   /*
   OS: Windows 10 build 19045
   Terminal: MetaTrader 5
   - Path: E:\MetaQuotes\MetaTrader 5
   - Data path: E:\MetaQuotes\MetaTrader 5
   - Common Data path: C:\Users\admin\AppData\Roaming\MetaQuotes\Terminal\Common
   */
  }