record maintained by a specialist that includes the specialist’s own inventory of securities, market orders to sell short, and limit orders and stop orders that other stock exchange members have placed with the specialist. The orders are listed in chronological sequence. For example, for a stock trading at 57 a broker might ask for 500 shares when the price falls to 55. If successful at placing this limit order, the specialist notifies the member broker who entered the request, and collects a commission. The specialist is prohibited from buying the stock for his own account at a price for which he has previously agreed to execute a limit order.