C<value> can be NULL.
+=item $h->download ($remotefilename, $filename);
+
+Download file C<remotefilename> and save it as C<filename>
+on the local machine.
+
+C<filename> can also be a named pipe.
+
+See also C<$h-E<gt>upload>, C<$h-E<gt>cat>.
+
=item $existsflag = $h->exists ($path);
This returns C<true> if and only if there is a file, directory
best effort attempt to run C<$h-E<gt>sync> when the handle is closed
(also if the program exits without closing handles).
+=item $h->set_busy ();
+
+This sets the state to C<BUSY>. This is only used when implementing
+actions using the low-level API.
+
+For more information on states, see L<guestfs(3)>.
+
=item $h->set_path ($path);
Set the path that libguestfs searches for kernel and initrd.img.
Setting C<path> to C<NULL> restores the default path.
+=item $h->set_ready ();
+
+This sets the state to C<READY>. This is only used when implementing
+actions using the low-level API.
+
+For more information on states, see L<guestfs(3)>.
+
=item $h->set_verbose ($verbose);
If C<verbose> is true, this turns on verbose messages (to C<stderr>).
Some internal mounts are not unmounted by this call.
+=item $h->upload ($filename, $remotefilename);
+
+Upload local file C<filename> to C<remotefilename> on the
+filesystem.
+
+C<filename> can also be a named pipe.
+
+See also C<$h-E<gt>download>.
+
=item $h->vgcreate ($volgroup, \@physvols);
This creates an LVM volume group called C<volgroup>