Leopard's ls

[LuKreme]

Ran across something interesting when doing an ls in the shell:

0 drwxrwxr-x@
0 drwxrwxr-x@
0 drwxrwxr-x
0 drwxrwxr-x
0 drwxrwxr-x+

 From the man page:

If the file or directory has extended attributes, the permissions  
field printed by the -l option is followed by a '@' character.   
Otherwise, if the file or directory has extended security information,  
the permissions field printed by the -l option is followed by a '+'  
character.

so, what exactly do 'extended attributes' and 'extended security  
information' mean? Are we talking about ACLs?

-- 
Everybody hates a tourist, especially one who thinks it's all such a  
laugh.  Yeah, and the chipstains and grease will come out in the  
bath.  You will never understand how it feels to live your life with  
no meaning or control, and with nowhere left to go.  You are amazed  
that they exist, and they burn so bright whilst you can only wonder why.