$sock = IO::Socket::INET->new(PeerAddr => 'www.perl.org',
                                 PeerPort => 'http(80)',
                                 Proto    => 'tcp');

   $sock = IO::Socket::INET->new(PeerAddr => 'localhost:smtp(25)');

   $sock = IO::Socket::INET->new(Listen    => 5,
                                 LocalAddr => 'localhost',
                                 LocalPort => 9000,
                                 Proto     => 'tcp');

   $sock = IO::Socket::INET->new('127.0.0.1:25');

   $sock = IO::Socket::INET->new(PeerPort  => 9999,
                                 PeerAddr  => inet_ntoa(INADDR_BROADCAST),
                                 Proto     => udp,    
                                 LocalAddr => 'localhost',
                                 Broadcast => 1 ) 
                             or die "Can't bind : $@\n";


##</code><code>##


   $sock = IO::Socket::INET->new(Listen    => 5,
                                 LocalAddr => 'localhost',
                                 LocalPort => 6969,
                                 Proto     => 'udp');