If either RTharp or Don can answer this:"say one person at your firm sells short the regular way on an uptick 1000 shares of ABC stock,and someone else goes long 300 shares of the same stock;can the one who is long sell his 300 shares on a downtick or must he sell it on an uptick since the firm is net short 700 shares? And are these 2 trading accounts considered separate accounts unlike proprietary accounts where everyone is basically trading one(the firm's)acount?