The workstation never blindly resends an order whose outcome is unknown, and orders are sent only by you or by protection rules you reviewed and switched on.
Tested on practice accounts and recorded data. The local MetaTrader 5 connection is not yet qualified for customer use.
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Explore Order safety.
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The behavior, explained
How it works.
Connections drop and applications restart. When the workstation cannot tell whether an order reached your broker, it keeps the original request and checks what happened instead of sending the order again.
Apart from orders you send yourself, the only orders the app sends come from protection you reviewed and switched on: trailing stops, stop-to-entry and partial targets. Those run only while the app is open, signed in and connected, and pause when you sign out, change account or lose the connection. When the app is closed, only the stop-loss and take-profit held by your broker remain.
Throughout the app, values that come straight from your broker or data source, values the app calculated, and values that are simply not available are shown differently, so you always know which is which.