Level II Viewer - brings NASDAQ's Market Maker information alive by displaying all Market Makers for a given security, a must for all professional U.S. equity traders, as well as non-professional Day-Traders. The Price Distribution Bar graphically displays the relative number of Market Makers in each price tier compared to all of the outstanding bids or offers ("Insiders"). It will help give you an idea of what price dominates the market at the moment and is located just under the Level I price information (1st set of vertical color bars). The Volume Distribution Bar graphically displays the relative number of shares in each price tier compared to all the total volume of all outstanding bids or offers ("Size"). It will help give you an idea which price tier has the greatest volume and is located at the bottom of the screen (2nd set of vertical color bars). A price tier is a group of bids or asks that are at the same price. The top 5 price tiers are color coded to group them together. Field definitions include: Primary Market Maker (PMM) indication for NASDAQ Level 2; NASDAQ UPC Indicator, "UPC" displayed indicates members may be required to close out short sales; ID of Market Maker (MMID); Insiders will show a number of how many quotes are yellow or how many inside quotes there are; Colors Changing, yellow indicates a price closest to the Nasdaq market, same prices have same colors, white indicates if the price is 6th closest or more from the Nasdaq Market; Quote shows an "R" which = an inside open. Level II Viewer

NASDAQ Power-View Level II SuperMontage - combines Level II data with aggregates of the NASDAQ SuperMontage order size at the top 5 price levels. It provides an unparalleled view of market activity, including: The best bid and ask price from each registered NASDAQ market participant. Aggregate size of all quotes and orders at each of the top five price levels in SuperMontage. The combination of these two enhanced features allows investors to see not only all of the sponsorship in a stock, but also to view unprecedented depth at and near the prevailing inside; The best bid and ask price from each registered NASDAQ market participant. Aggregate size of all quotes and orders at each of the top five price levels in SuperMontage. The combination of these two features allows users to see not only all of the sponsorship in a stock-but also to view unprecedented depth at and near the prevailing inside. Depth View provides the aggregate size of all quotes and orders at each of the top five price levels in SuperMontage. DepthView will allow active investors to determine the number of shares they can trade within NASDAQ without having a substantive price impact. It also provides users with the ability to evaluate liquidity trends at and near the prevailing NASDAQ inside price.

OpenBook Viewer - The OpenBook Viewer provides a real-time view of the New York Stock Exchange's limit-order book for all NYSE-traded securities. OpenBook Viewer lets traders see aggregate limit-order volume at every bid and offer price, thus responding to demand for more depth-of-market data and raising the NYSE market to an even greater level of transparency. Since the switch to decimal prices, demand for market-depth information has surged. This is largely attributed to the fact that with liquidity spread out over 100 price points-instead of the 16 under the previous fractional-pricing system-traders and other market participants have found depth of market difficult to discern.