The title is self-explanatory.
Anything of that sort
\href{run:path/to/file.pdf#chapter2}{go to chapter 2 of file.pdf}
?
hyperref
\href
macros2e
macros2e.tex
\exthref
source2e.pdf
hyperrefwork between two files? – Werner Mar 10 '13 at 15:09\hrefin such situation can be found in the packagemacros2e. In the filemacros2e.texthe macro\exthrefcreates links to the filesource2e.pdf... – e-birk Mar 10 '13 at 16:10