[Samba] Limiting user logons (XP + Samba as PDC)

[xfesty]

Hiya...

I've looked at this before, but this might have changed with Samba 3.0 
- is it possible to limit the logons of each user - so they can only be 
logged onto one workstation at once?

Also, when a user logs off from a workstation, does samba know about 
this?  Is it possible to send a signal or something to another process 
when this happens?  If so, how?

Cheers

R