Trigger order on IB

Discussion in 'Retail Brokers' started by Option Trader, Dec 13, 2007.

  1. Under "conditional", one can use a trigger to place an order with IB. E.g. if the price goes below $19, then that would trigger a buy-to-open order.

    IB allows you to define what "the $19" goes based on.
    Can anyone explain what it means "double last" , "double bid", and "bid/ask"? Note: i would like to go based on the ask price, and want to know how to apply it.