relative orders are only accepted if submitted as best or best ecn. i'm sure you read this link on how they work... http://www.interactivebrokers.com/html/tws/relative_orders.html i am 99% certain that IB handles the modifications itself and does not pass the order to bberg so they can handle it. This ofcourse does not preclude bberg from getting the limit order or a modification. The main reason for the relative order implementation was to accomodate basket traders who can possibly get better fills and/or not move the market as much when submitting this type of order. I'll confirm this and if i'm wrong i'll repost. as for having a number of versions on the site to download, i was thinking of the same thing this weekend. i'll suggest it today.