On Windows session boot - Excuse for my english

[Hamza.Badidi@ulp.u-strasbg.fr]

Hello,
  I think I've understood globaly how do Kerberos 5 works.. But I  
still have some questions about the manner the authentication is made  
on the boot of the session (just after when we enter our loggin and  
password). How the authetication is exactely made?
-Is a Daemon present in the client machine (as soon as the the session  
starts) establish the communication with the KDC server and requests  
the ticket?
-If so, how and where do that daemon picks up the username in that  
client machine?

Thanks a lot!
Hamza.