A method of processing a transaction over a network, the method includes generating a listing associated with a first user and a good or service and conducting a first transaction associated with the listing in response to a selection of a second user. The method also includes conducting a second transaction...http://www.google.com.hk/patents/US20020083016?utm_source=gb-gplus-share專利 US20020083016 - System and method for enabling transactions over a network using multiple channels
