Remember that it is always in the brokers' best interest to fill an order at the best available price. DRT orders can be especially useful if you have made prior arrangements with the floor or the specific filling broker when you need assistance in executing a large order or in especially thin markets. As futures and options trading becomes more and more sophisticated, new strategies and techniques may arise. There may be two buys and no sells, the quantity may be a ratio, it may include futures and options on the same order, and many more. If you have any questions about an order, discuss your intentions with your broker or clerk before order placement.
Different exchanges accept different orders.
All of the orders which discussed here are not accepted by all exchanges. All of the orders described in this section are acceptable. For specific information regarding the contracts and types of orders accepted, please contact your broker or clerk. Any individual exchange may change the orders which it will accept without prior notice, and even a particular executing broker at a given exchange may refuse to accept certain types of orders at their sole discretion. However, the extra seconds that it may take to write out the commodity and month may prevent errors.