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 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.