>With Win2PDF printer I always use:
>
>set printer to name PDF_PRINTER
>report form ... to file PDF_file.pdf
>
>It does not require the user interaction.

I do similar with Amyuni (installed as a printer driver):

...
...
oPDFPrinter.PDFDriverInit("Amyuni PDF Converter")
* Set the destination file name
oPDFPrinter.DefaultFileName = tcFileName
Set Printer To Name "Amyuni PDF Converter"
Report Form (cReportName) Noeject Noconsole To Printer

No user intervention needed.