I have a function that takes a filehandle for an argument. This is easy for filehandles that you create with
open() but gets more complex if you try to use one of the automatic filehandles. Using the
* syntax you can create a pointer to the symbol table for that entry.
$fh = \*STDIN; $fh = \*STDOUT; $fh = \*DATA;
Once it's a standard scalar variable it can easily be passed to a function.