COMPUTER SOFTWARE FOR ENABLING BROKERAGE FIRM CUSTOMERS TO TRADE AND INQUIRE ON THEIR ACCOUNTS THROUGH MOBILE DEVICES, NAMELY, NOTEBOOK COMPUTERS, PERSONAL DIGITAL ASSISTANTS, TWO-WAY PAGERS AND CELLULAR PHONE EQUIPPED WITH A GLOBAL COMPUTER NETWORK BROWSER, AND FOR RETRIEVAL OF REAL-TIME STOCK MARKET QUOTES, QUOTE ALERTS, AND NOTIFICATIONS OF EXECUTED TRADES VIA A GLOBAL COMPUTER NETWORK