Good question ... before I started this thread I assumed ISLAND hidden orders were native NASDAQ hidden orders, and that appears to be the case if you watch the orders go in and check TotalView ... also, all the non-ISLAND hidden SMART-routed orders I tried routed straight to ISLAND and stuck there without showing up in the depth ... but after plodding along with this thread for awhile I'm no longer sure of anything to do with this topic ... I'm thinking IB is going to do whatever they feel like doing with hidden order types and not bother telling us what they are doing, when, or why.