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=head1 Object Implementations

=over 4

The POA supports modes of operation where a single servant
may incarnate multiple object references. For this reason,
it is not, in general, permissible to supply a servant
where an object reference is required. However,  in
situations where it is valid to call the _this() method of 
the servant, an ORB may do this transparently when
a servant is used in place of an object reference.

=head2 Implementing interfaces

Interface are implemented by deriving from the package corresponding 
to the interface prepended with "POA_".

  package MyAccount;

  @MyAccount::ISA = qw(POA_Bank::Account);