+\r
+{on windows up to XP, listening on ipv6 will not listen on ipv4, while on other platforms it does, \r
+so a single listener cant get all connections for a port number, only those for one address family.\r
+also it means a portable app would gave to deal with inconsistent behavior.\r
+enable this option to simulate the behavior of listening on both v4 and v6}\r
+\r
+{$ifdef win32}{$ifdef ipv6}\r
+{$define secondlistener}\r
+{$endif}{$endif}\r