StocksTrader supports the Stop Out order (automatic closure of open position if the Margin Level gets to a certain low point, Margin Call is not provided). The percentage at which Stop Out is triggered depends on the specific broker and trading conditions. Typically, a Stop Out is triggered when the margin level falls below a certain threshold, which can range from 20% to 50%. 

This means that if your own margin becomes too low, the open positions will be automatically closed.