? about trailing stops in MT4

If I place an order and then right-click on the position in MT4, there is an option for trailing stops. Is that trailing stop executed by the MT4 program or is it somehow put into the order and executed by the broker?

thank you

Trailing Stop works in the client terminal, not in the server (like Stop Loss or Take Profit). This is why it will not work, unlike the above orders, if the terminal is off. In this case, only the Stop Loss level will trigger that has been set by trailing stop.