>Does anybody knows how to print in VFP6 2 different reports with graphics in a single sheet (Duplex printing)

If you have access to Microsoft Word, you might be able to use a combination of FRX2Word (available for download here) and Word automation. Assuming you can control Word's print dialog you should be able to specify duplex printing.

Another approach might be to print both reports to separate disk files, pull them into VFP string variables with FileToStr(), parse the first one to remove page-eject codes, append duplexing codes instead, then write out a final file combining the two reports with StrToFile(). This file can then be sent to the printer or print queue. This approach does not require Word but will require knowledge of control codes of your specific printer.