Restriction for unauthenticated RPC Clients - Effective Values:Vis

Hi

The Group Policy setting "Restriction for unauthenticated RPC clients" has
following possible values:
1) Not configured
2) Enabled:
Authenticated
Authenticated with exceptions
None
3) Disabled

It is explained in the settings help that :
"If you disable this setting or do not configure it, the value of
Authenticated will be used for Windows XP and the value of None will be used
for Server SKUs that support this policy setting."

Now there are two question that I have:
1) What is the effective value of Not Configured/Disabled for Vista?
2) What is difference between Not Configured and Disabled values?


Thanks & Regards,
Somesh