I saw the following page: http://pearlmancta.com/To Open Account.htm Such CTA use many FCM and Interactive Brokers is one of them. It looks like Interactive Brokers can support "GIVE-UP" or "TAKE-IN"? Does any CTA or CPO use Interactive Brokers as FCM and use their "GIVE-UP" or "TAKE-IN" function? Please share your experience. Thanks.