Mountain View, Ca., July 18 -- With the support of Intuit and MasterCard International, Netscape Communications has announced Secure Courier, an open, cross-platform digital envelope. The new protocol allows secure transfer of credit card, debit card and micro-transactions across the Internet. Secure Courier is an open, cross-platform protocol, meaning it will operate in Macintosh, Windows, and Unix operating environments common to Internet traffic. Specifications for this new protocol are currently available from Netscape's World Wide Web site at http://home.netscape.com/newsref/std/credit.html . _________________________________________________________ New York, NY, July 18 -- American Express' Travel Related Services Company said it is establishing relationships with four technology companies for secure Internet credit card transactions using the American Express card and the Optima card. The four companies involved, CyberCash, First Virtual Holdings, Netscape Communications Corporation, and Open Market, have different ways of securing transactions over The Internet's World Wide Web.