AFAIK 'static' vs. 'dynamic' price ladder is the answer, seeQuote from Bernard111:
Is there any version of Transact/yestrader that keeps the bid/ask volume when you place a buy/sell limit using the vertical DOM ? I'm wondering why Pats was able to do the 'trick' tru the TT patents with Jtrader Reflector while Transact no.
www.elitetrader.com/vb/showthread.php?threadid=44736
www.elitetrader.com/vb/showthread.php?threadid=53954
www.elitetrader.com/vb/showthread.php?threadid=55104
www.elitetrader.com/vb/showthread.php?threadid=56833