NASDAQ
This is the link to the official site of the NASDAQ market place. It is filled with relevant and important information. We suggest that you visit this site on a regular basis to keep yourself up to date on all new products and changes in the market place.

INET
INET offers U.S. broker-dealers access to one of the most robust liquidity pools in NASDAQ equities, substantial liquidity in U.S. exchange-listed securities, and routing access to other major U.S. trading venues. Our trading platform is fast, anonymous, reliable and cost-efficient, designed for scalability in high-speed, high-volume electronic trading.

Archipelago
This link will allow you to open a level 2 window of all the depth on stocks traded on the ARCA ECN. Other information are also available.

Short List
This list will allow you to know ahead of time if the stock you plan to trade is shortable or not. This list is updated every day, early in the morning.

Market Makers
This list will give you all market participants that are NASD registered. The four letter symbols you see in the level 2 box are the abbreviations of the brokerage firms listed here. For example: FDDL are the letters identifying the brokerage firm FD de Leeuw & Associés, Inc. Trade Desk America.

Holidays
This list will give you the days that the market places are closed in the United States. Some other holidays are not listed if they happen on a regular trading day that is not closed.