MS-DOS based applications are designed to print on character mode printers. Presently many laser and inkjet printers have powerful features but comes with USB port which DOS application can not Access. DOS2USB extend the ability of DOS programs by capturing MS-DOS print job and redirect them on windows printer irrespective of their types including USB Printers, Network Printers, Print-Servers, as well as PDF-printers too! (WINDOWS) $19.99