When using a "show only" order with an ECN (i.e. buy 500, show only 100) does the entire 500 shares maintain the time priority the initial order is received, or does just the 1st 100 shares get that time priority, with the remaining blocks being restamped after the 1st 100 are sold? Hence, if you do the above order, and someone else subsequently enters another buy order at the same price on the same ECN, and then a matching sell order comes through for say 200 shares, do all 200 shares go to you, or just 100, then 100 to the other person, with your remaining 400 put in as new order with a new time? Can't find this answer anywhere on the ECN websites! Anyone know??? And is it the same for all the ECN's that allow show only orders?