Ok I've found the solution : starting a new floating cmd window :

buf.append("start cmd.exe /a /k c:\\sql\\launchsql.bat ");
buf.append(source);

buf.append(" ");
buf.append("C:\\sql\\tmp");
buf.append(" ");
buf.append(User);
buf.append(" ");
buf.append(Password);
buf.append(" ");
buf.append(Database);


the commando extension is REALLY wonderfull !!!!!! really good work !!!!