On-line trading services in which users post requests for products and negotiate transactions via the Internet; Providing information pertaining to procurement, buying, selling and tendering information and opportunities relating to goods, services, and construction via computer, computer networks, telephone, the internet or electronic mail; The bringing together, for the benefit of others, of a variety of goods and services, enabling customers to conveniently view and purchase those goods and services from an Internet web site particularly specializing in the marketing of the sale of goods and services of others