void PS_add_pdflink(PSDoc *psdoc, float llx, float lly, float urx, float ury, char *filename, int page, const char *dest)
Places a hyperlink at the given position pointing to a second
pdf document. Clicking on the link will branch to the document at the
given page. The first page in a document has number 1.
The parameter dest determines how
the document is being viewed. It can be fitpage, fitwidth,
fitheight, or fitbbox.
The hyperlink start is
a rectangle with its lower left corner at (llx,
lly) and its upper right
corner at (urx, ury).
The rectangle has by default a thin blue border.
The hyperlink will not be visible if the document is printed or
viewed but it will show up if the document is converted to pdf by either
Acrobat Distiller® or Ghostview.