ADVERTISING AND MARKETING SERVICES FOR CLIENTS WHO SELL THEIR PRODUCTS OR SERVICES VIA THE GLOBAL COMPUTER NETWORK, NAMELY, PREPARING AND PLACING ADVERTISEMENTS IN PERIODICALS, DISSEMINATING ADVERTISEMENTS FOR OTHERS VIA THE GLOBAL COMPUTER NETWORK, DIRECT MAIL, AND IDENTIFYING POTENTIAL PURCHASERS OF ITS CLIENTS' PRODUCTS OR SERVICES TO PROVIDE DIRECT ADVERTISING BY THE MAIL, GLOBAL COMPUTER NETWORK, AND PERIODICALS