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http://www.mandtbank.com/myaccounts/wt_faqs.cfm
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Q. Am I able to place after-hour trades?

A. M&T Securities Discount Brokerage does not execute trades during extended trading hours. You can however submit your orders 24 hours a day through the convenience of your computer. If your order is placed before 4:00 p.m. EST on a day the markets are open, it will be executed on the day it is placed. Otherwise, the order will be executed the next trading day. Please click here for Types of Orders that may affect when your order is executed.
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Q. What if I need to cancel an order?

A. You can modify or cancel unexecuted limit and stop orders on the Order Review page. Because market orders must be executed as promptly as possible, it may not be possible to cancel a market order since it may already have been executed even if you have not yet received a confirmation of the execution. Off-hour orders may be modified or canceled before the market opens.
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Placing "limit" orders
A limit order allows you to avoid buying at a price higher than you want, or selling at a price lower than you want. A limit order is an order to buy or sell a security at a "specific price or better." The trade will only be executed within the price restriction....

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Note added at 16 hrs 13 mins (2005-08-17 08:17:26 GMT)
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bid слишком профессиональный термин
обычный инвестор simply places his/her orders to sell or to buy

и по умолчанию на рынке все заявки безадресные.