ENABLING BUSINESS-TO-BUSINESS PROCUREMENT SERVICES OVER A GLOBAL COMPUTER NETWORK; INCLUDING CREATING AND PROVIDING COMMERCE-RELATED COMMUNICATIONS INTERFACES ON A GLOBAL COMPUTER NETWORK, TO LINK AND INTEGRATE MULTIPLE LEGACY SYSTEMS TO PROVIDE UPDATED PRICE, ORDER, ORDER CHANGE, SALES HISTORY, SHIPMENT TRACKING, INVOICING, PAYMENT, RECONCILIATION AND CREDIT/REBATE INFORMATION; CREATING AND MAINTAINING PRODUCT CATALOGS AND CATALOG INFORMATION RELEVANT TO SPECIFIC INDUSTRIES OVER A GLOBAL COMPUTER NETWORK, INCLUDING STANDARD STOCK KEEPING UNITS AND PRODUCT UPDATES, AND ENABLING TRANSACTIONS FROM SUCH CATALOGS; PROVIDING SOFTWARE, CONSULTING, TRANSACTION ENGINES AND RELATED TECHNOLOGY ENABLING CUSTOMERS TO CREATE CUSTOMIZABLE BUSINESS-TO-BUSINESS E-COMMERCE COMMUNITIES