[Samba] remove machines from login list

[steve]

Hi

When adding a windows machine to a Samba domain:

add machine script = /usr/sbin/useradd  -c Machine -d /var/lib/nobody -s 
/bin/false %m$

The machine name (e.g. computer_1$) now appears in the kdm login list 
for Linux clients using kde4. This looks a mess and doesn't make sense.

Can I add the machine without using 'useradd'? Or some other way to 
avoid this?
Thanks Steve.