I should have been more explicit when I used the word “margin call”.
Aha. Thank you for your clarification,
… a pattern daytrading …
Stocks have a lot of stupid rules. I agree with you, the rule is outdated with comparison to options/futures/forex. However law is law. "Roman law in the same manner was a rule of expediency, rightly or wrongly conceived, with comparatively little tincture of religion. " lol
I disagree with your opinion about extreme-os.
Sure. You have full right for your disagreement. However, it was a point of weakness from my side to start discussing the system. Let’s say that we have different opinion for the system 
I know that Tango uses many cancellations, so a change of the intepretation of that command may be relevant for you too…
It’s relevant for me. On huge fast movements my subscribers might have the same problem. There is only one difference I don’t replace orders.
Eu
