Computer software for use in reverse auction services, namely, for use in allowing registered buyers to post via a global computer network purchasing requirements by line item in either an open or private auction format, while concomitantly allowing registered vendors the opportunity to bid to provide those goods and services via a global computer network; computer software for use in credit card verification services to keep information secure on a global computer network and for use in facilitating e-commerce business solution and consulting services, namely, arranging, coordinating and implementing the business to business sale of goods and services; computer software for use in allowing registered buyers to build line item-based estimates from product databases and for use in providing access to computer software and information databases maintained and compiled on a global computer network, including information regarding credit worthiness of registered users; computer software for use in providing an on-line searchable ordering guide for locating, organizing and presenting goods and services of others and for use in database aggregation, integration and management