We are going to create some addon in the desktop app that monitors those trades

[PopovDS]

Hello Eduardo and everybody in NT8 support.
Let me join the discussion too. I am kaseipds's partner. Kaseipds is a generator of trading ideas, and I am a coder who translates the idea into the script. As a coder I have some questions. Let's imagine the following trading environment.
1. The user has an opened browser with some tabs containing trading consoles of web ninjatrader.
2. The user has launched desktop instance of NT8.
3. The user trades in the web.
4. Once the user places entry/exit order he can also see the trade in the desktop app somewhere in trade performance UI. So, the trades are synchronized.
5. We are going to create some addon in the desktop app that monitors those trades and calculates total PnL. If total realized PnL reaches some threshold value, the addon makes the following steps:
a) flattens all active positions
b) doesn't allow any trading operation both in the web and desktop consoles until the end of the session.
I don't know yet how to manage point "b"... There may be some properties and/or methods of the class Account to get desired functionality...
Is the algorithm described above implementable?

[NinjaTrader_ChelseaB]

Hello PopovDS,

"Once the user places entry/exit order he can also see the trade in the desktop app somewhere in trade performance UI. So, the trades are synchronized."

The desktop application is able to see order, execution, and position updates from the Account object of the connected account.

https://ninjatrader.com/support/helpGuides/nt8/executionupdate.htm

https://ninjatrader.com/support/helpGuides/nt8/orderupdate.htm

https://ninjatrader.com/support/helpGuides/nt8/positionupdate.htm

The web trader is also processing those same order, execution, and position updates.

"flattens all active positions"

This can be done by calling <Account>.Flatten() and providing a list of instruments to flatten.

Account myAccount = Account.All.FirstOrDefault(acct => acct.Name == "Sim101");
myAccount.Flatten((from position in myAccount.Positions select position.Instrument).ToArray());​

"doesn't allow any trading operation both in the web and desktop consoles until the end of the session"

It would not be possible to prevent the trader from placing new orders in the web trader.

On the desktop application, it would not be supported to prevent an order placed through a native trading window, but you can have the user place orders through the addon from button clicks, and have the addon logic decide if the order will be submitted or not submitted.

The ChartOrderButtonsIndicatorExample below demonstrates placing orders with button clicks through an account object. This uses the addon approach which also could be used in a separate addon window if desired.

https://support.ninjatrader.com/s/article/Chart-Order-Buttons

From the button click event handler method you can check the <Account>.Get(AccountItem.RealizedProfitLoss) + <Account>.Get(UnrealizedProfitLoss) and if this is above a certain value call the order submission with <Account>.CreateOrder() and <Account>.Submit().

https://ninjatrader.com/support/helpGuides/nt8/get.htm

https://ninjatrader.com/support/helpGuides/nt8/accountitem.htm

https://ninjatrader.com/support/helpGuides/nt8/createorder.htm

https://ninjatrader.com/support/helpGuides/nt8/submit.htm

If you are not familiar with NinjaScript, below I am also providing a link to a forum post with helpful resources on getting started with NinjaScript and C#.

https://support.ninjatrader.com/s/article/Developer-Guide-Getting-Started-with-NinjaScript

[PopovDS]

Hello Chelsea B.
Thank you for such detailed explanation!