OPERATING INDUSTRIAL MARKETPLACES VIA A GLOBAL COMPUTER NETWORK FOR BUYERS AND SELLERS OF GOODS AND/OR SERVICES IN ENERGY-RELATED MARKETS, NAMELY, NATURAL GAS, PROPANE AND OTHER GASES USED IN INDUSTRIAL PROCESSES; PROVIDING INFORMATION, NAMELY, NEWS, RESEARCH AND DIRECTORIES OF GOODS, SERVICES, BUYERS AND SELLERS IN ENERGY-RELATED MARKETS VIA A GLOBAL COMPUTER NETWORK