Providing temporary use of on-line non-downloadable software and applications for preparing invoices, preparing invoices based on data submitted in spreadsheets, tracking payments of invoices, and sending reminders for unpaid invoices.; Providing an online non-downloadable Internet-based system application featuring technology enabling users to prepare invoices, prepare invoices based on data submitted in spreadsheets, track payments of invoices, and send reminders for unpaid invoices.; Provi...