Windows 2k & XP can do this easily with a little modification of the registry. Follow these steps on the workstations to force the autologon with the account you want.
This registry change will bypass the Winlogon dialog box.
To enable this function you need to add several new values to the key below.
1. Click on START > Run >type regedit
2. Goto the key value:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
3. Add a new string value named 'DefaultUserName' and set it to the username you wish to automatically logon as.
4. Add a new string value named 'DefaultPassword' and set this to the password for the user entered above.
5. Add a new string value named 'AutoAdminLogon' and set it to 1
6. Add a new string value named ?ForceAutoLogon? and set it to 1.
7. Verify the DontDisplayLastUserName value is set to 0.
8. Verify the DefaultDomain is set to the proper domain.
Exit and restart, Windows should not ask for a password and automatically show the desktop of the user.
You can see the complete reg hack (along with pictures) at
http://www.winguides.com/registry/display.php?13
Good Luck,
Mike