=head1 RETURN VALUES

Upon successful completion, a value of B<0> (B<XER_OK>) is returned.
Otherwise, one of the following error codes is returned:

=over 5

=item *

B<1 => B<XER_Usage>

=item *

B<2 => B<XER_Abort>

=item *

B<3 => B<XER_PartialSuccess>

=item *

B<4 => B<XER_PasswordRequired>

=back

