How do I prevent multilple logins from a single user account

[dcxman 0]

Morning all.

 

I've got people on my 2003 AD sharing their accounts when they shouldn't be. So in short, how do I prevent these a**hole* from logging in multiple times with their logins which they have shared?

 

I remember in Win2K in the local policy settings your were able to do this by selecting that feature but I've noticed it no longer exists in the same area for 2003.

 

Can anyone tell me where it's moved or if it still exists.

 

Thanks in advance as always.