Prevent uid sharing or hot to allow use uid only once

[A.L.M.Buxey at lboro.ac.uk]

Hi,

> What I meant if that employee John pass his coworker Joe their
> credentials, both user and password, well that could not be so
> terrible. Now, let's suppose then that your company organize an event
> an come 100 people, they want to use wireless network, so John comes
> and has the "great" idea of passing their credentials to attendants,
> so you have more than 100 people using the same uid and password at
> once...

simultaneous-use - only allow one instance of the user/pass
to be online at a time.

sure, another person might be on instead of John...but then
John wont be able to get online...He'd very quickly be miffed
that he'd lost his access due to someone else using his credentials

alan