[Samba] cups driver

[stenon]

hi ,
so my samba server :
$ smbd -V
Version 3.0.14a-Debian

and my smb.conf :

[global]
        log file = /var/log/samba/log.%m
        dns proxy = no
        netbios name = pykota
        security = user
        passwd chat = *Enter\snew\sUNIX\spassword:* %n\n 
*Retype\snew\sUNIX\spassword:* %n\n .
        server string = sprint
        socket options = TCP_NODELAY
        invalid users = root
        obey pam restrictions = yes
        workgroup = PyKoTa
        os level = 20
        auto services = printers
        encrypt passwords = true
        syslog = 0
        passwd program = /usr/bin/passwd %u
        passdb backend = tdbsam guest
        panic action = /usr/share/samba/panic-action %d
        max log size = 1000
        load printer = Yes
        printing = cups
        printcap name = cups
        use client driver = yes
[printers]
   comment = All Printers
   browseable = Yes
   path = /tmp
   printable = yes
   public = yes
   writable = no
   create mode = 0700

# Windows clients look for this share name as a source of downloadable
# printer drivers
[print$]
   comment = Printer Drivers
   path = /var/lib/samba/printers
   browseable = yes
   read only = yes
   guest ok = yes
# Uncomment to allow remote administration of Windows print drivers.
# Replace 'ntadmin' with the name of the group your admin users are
# members of.
  write list = root, @ntadmin


i've just seen  in my config "invalid users = root"    -> it's important ?

i did smbpasswd -a root ? usefull or useless ?

thanks