Operating electronic marketplaces to facilitate transactions between buyers and sellers of goods or services; services for collection, preparation, composition, processing, acquisition and provision of business information related to buyers, sellers and transactions between buyers and sellers; business process re-engineering services; advertising and publicity services; computerized database management; data processing services; customer service in the field of electronic marketplace transactions, namely, support for buyers and sellers regarding business transactions that they or other parties have made; facilitating the exchange of needed information for electronic payment via the Internet; integrated tracking and management of commercial transactions on a global computer network