Reservation form: two orders are set at the same time, but the second order (sub-order) will take effect only after the first order (parent order) is completed; If the parent document is not sold, the child document will not be sold even if the exchange rate reaches the price set by the child document.

One-way order: a single take profit or stop loss order.

Two-way order: two orders are set at the same time. When either order is closed, the other order will be cancelled automatically.

Booking two-way order: it is a combination of booking order and two-way order. Three orders are set at the same time, the first is the parent order, and the second is the child order (two-way order). The child order will not take effect until the parent order is completed. After the two sub-orders take effect, either one will be cancelled automatically.