      Every third Friday of each month, the stock market experiences a largesurge in MOC orders associated with the expiration of several indexderivative products. In order to facilitate the pricing of the large volumeof expiration-related MOC orders, the NYSE has introduced special order-entry cancellation procedures. On monthly expiration days, no MOC orders inany stock can be canceled or changed after 3:45 p.m. Also, MOC ordersrelating to any strategy involving any index derivative product must beentered before 3:00 p.m.