Build simple app to Call API using existing DLL

Hi, I have DLL that calls an API, the API is used to place trades on a broker. The DLL is executed by a trading platform(MT4), which doesn't have asynchronous capability. What I need is being able to call multiple instances of the API asynchronously, so the trades gets placed simultaneously on multiple brokers (each with a different token) I need a simple external application that can receive the signal from MT4, and then execute multiple treads of the DLL. I don't need anything too fancy, just an app that can store multiple API tokens (or ideally grab them from a text file), and execute the DLL. I have attached the source code of the DLL, as well as the MT4 components. Below is a sample code used to call the API from MT4. You can see that the 3 API calls are executed sequentially, creating a delay in the second and third instance. So I need to be able to call it only once, and then have the external app handling the multi treads. I'm thinking of something in C# or C++, but I'm open to suggestions on how to achieve this in the easiest way. ---------------------------- #property strict #include <[login to view URL]> void OnStart() { string response = CallBinary(1); //Call 1 InitBinary("testapi1", USD, "frxEURCHF", 5, m); response = CallBinary(1); //Call 2 InitBinary("testapi2", USD, "frxEURCHF", 5, m); response = CallBinary(1); //Call 3 InitBinary("testapi3", USD, "frxEURCHF", 5, m); response = CallBinary(1); Sleep(5000); }