PDF on TOP of another

Yes, WPViewPDF can do this.

{:: This functions loads data from a stream and return an identifyer for a given page.
First call LoadPDFWatermarkFromStream and for all pages LoadPDFWatermarkStreamGetPage.
Use the result of LoadPDFWatermarkStreamGetPage in
wpviewpdf1.CommandStrEx( COMPDF_ApplyWatermark, '1', id ); // '1' is the page number or the range!
}
function LoadPDFWatermarkFromStream( Stream: TStream; StreamID : Word ): Integer;
function LoadPDFWatermarkStreamGetPage( StreamID : Word; PageNo : Word ): Integer;

Hi,

I would like to open a PDF file, add an other one that covers part of the firt page of the first one and export it or print it.

How can I do that, something like overlay ?

Many thanks.

Best regards.