Description
bool 
ps_add_launchlink ( resource psdoc, float llx, float lly, float urx, float ury, string filename )
   Places a hyperlink at the given position pointing to a file program
   which is being started when clicked on. The hyperlink's source position
   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 Distillerâ„¢ or Ghostview.