appletalk

Have an ibook (airport card) , well my wife does, running on the home
wireless network. Uses tcp/ip and appletalk is enabled.
Have installed an HP psc 750 on a windows 2003 server, have also installed
file and print services for mac on the 2003 server. The server appears in
chooser but there's a problem with authentication.
How does a mac authenticate with a NT/2000/2003 server?
There was also a message about adding a folder to the extensions folder (but
it was already there!)

Roy