Hopefully this page will eventually be padded out with some details on using the sockaddr_storage structure for AddressFamily independent socket addressing. Until then you can find out some more in 
RFC:3493.
Or bug 
MattBrown to remember to update the page when he's worked out how to do things with sockaddr_storage nicely :)
One page links to SocketAddressing:
lib/main.php:944: Notice: PageInfo: Cannot find action page