Call API asynchronously from Expert Advisor

Hi, I have an Expert Advisor that calls an API, which executes trades on a Binary Options broker. My problem is that now I need the EA to call the API multiple times simultaneously (to place trades on friends accounts). The Call takes about half second to execute, so if I put them under under each other the bottom ones get delayed. So what I need is to execute all API calls asynchronously. Please see example below, I need Call1, Call2 and Call3 all executed at the same time, or at least as close as possible. Can someone please point me to the right direction and give me a code example and/or step-by-step instructions of how to achieve this? This is rather urgent. ------------------------------------------------------------- #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); }