Computerized information and interactive on-line services provided via a global computer network, for use in exchanging business information and facilitating business to business transactions; providing a virtual marketplace for sellers of goods and services via a global computer network, namely providing a web site where businesses can put their purchasing needs for business products and services out for bid, receive quotes for vendors, and elect to complete sales transactions either on-line or offline; promoting the sale of goods and services of others through the distribution of materials and promotions via a global computer network