The Investor Password is a Read Only access, meaning no trading activity can be made when logged in via the Investor Password.
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This is used for when there are investors wanting to see the account trades, balance and history in MetaTrader, without allowing access to placing or modifying trades.
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The trader or account owner (who uses the main password), can send the investors the Investor Password and account number (not the main password) so that they can stay up to date on the activity for the account.