Microsoft Word for Windows does not provide a method for Automation clients to set the duplex print flag before starting a print job. Although there is a parameter in the PrintOut method that indicates support for duplex printing, the parameter does not provide true duplex printing and may not be available depending on your operating system or installed language. However, developers can work around this limitation on Windows systems by changing the duplex flag for the active printer driver befor
链接：
http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/q230/7/43.asp&NoWebContent=1#appliesto
