万能打印机驱动，可以驱动世面上大部分的打印机(Universal printer driver, which can drive most of the printers in the world)

emfprinter 是一款开源的打印程序，能够实现对打印文件的监控，转换等 操作，版本为最新的0.3.3，支持Win7(EmfPrinter is a virtual printer driver)

DesktopApp平台通过winspool接口实现对打印机驱动的监控，并接收印刷Job状态变更事件。(DesktopApp platform to achieve control of the printer driver through the winspool interface, and receive a printed Job state change events.)