auth_get_attr — get the specified attribute from the authorisation file values
use Wacs;
| scalar auth_get_attr( | ip_address, | |
| authorisation_attribute ); | 
| scalar  | ip_address; | 
| scalar  | authorisation_attribute; | 
auth_get_attr returns the specified attribute from
the authorisation file or it's default value if not specified there.  These
look ups are based on the IP address of the host - typical attributes include
the user name, the preference exclusions, the role, and the various
preference settings - see add_auth for more info.