open orders removal

[Naihan]

when i subscribe to receive the list of orders from a specific exchange, i receive only the last 40 orders at a time (buy/sell).
What happens if an order has been deleted? do i receive some sort of an indication for that?

[robborden]

These are the top 20 bids and asks at the time when they are sent. All 20/40 should replace the previous 20/40.