Providing temporary use of on-line non-downloadable software and applications for conducting transactions between vendors and purchasers, namely, software and applications for managing inventory data and imagery; software and applications for displaying products; software and applications for managing order fulfillment logistics; software and applications for enabling communications between vendors and prospective purchasers; software and applications for selecting and purchasing products; software and applications for enabling purchasers to schedule order fulfillment; and software and applications for compiling supply and demand and interest data for specific vendors, purchasers, and products