MetaTrader’s built-in alert mechanisms. In MQL4/5, calling Alert() pops up a message window on the desktop terminal. Calling Print() writes to the Journal/Experts log. For external alerts, SendMail() queues an email to the configured address and SendNotification() pushes a text alert to the MetaTrader mobile app. Thus an EA can notify the trader via on-screen dialogs, emails, or smartphone notifications. For example, an EA might Alert("Order executed") for beginners, or use SendNotification("Buy EURUSD now") to send a mobile push to an advanced user.

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