I use Interactive Brokers ( IB ) but am not resident in US. If I short a stock option and subsequently exercised against, will IB automatically deduct funds from my account and take up the stock for me. And what if a dividend is declared on the stocks I now hold, will they be sent to my home address or is it credited into my IB account? If I am short calls on a stock and exercised against, am I now short the underlying stock? Is this allowed with IB? Do I have to buy back the stock within a certain time frame?