in fig4 f 1 entity subscriber preferences in fig4 f 2 entity subscriber authorization in fig4 f 3 user buy sell preferences in fig4 f 4 and user notification preferences in fig4 f 5 as is apparent from each of the above noted drawings the functionalities represented by each of those tools are conventional and would be known and or implementable by one of skill in the art such functionalities as well as any others illustrated in this application but which have not been specifically described are assumed to be implemented using conventionally known software techniques known in the art with respect to the user notification preferences as shown in fig4 f 5 the system may be programmed to notify the user depending on the type of occurrence and or the method of communicating the notification for example if the user is off line and not currently logged in to the system the user may have the system programmed to transmit a notification when only certain assets receive a bid or offer or when a received bid or offer meets predefined minimum requirements in accordance with the notification function which will be discussed further hereinbelow also this tool may be used to notify the user through an e mail or text message to his her cell phone pda or other portable communication device or to notify the user at one or more predetermined locations via facsimile for example the system may be programmed to send a fax to the user 39 s home office the user 39 s office or even to a hotel as shown in fig5 the notification function as used in previously discussed modules or operations involves determining whether another posting matches the bid or offer that was just posted see step.