Quote from ironmind:
Thank you, def. I have checked, and can I ask you a question: for a cash account of interactivebrokers (as it seems that i am not qualified for a margin account), which can not convert currency and can only trade in base currency only by its definition, how could I trade USA and Hongkong listed stocks simultaneously? Or at least can I trade USA stock today with USD as base currency and trade Hongkong stock with HKD as base currency tomorrow? Thank you very much!