Note: the technical details are documented on the D-PHYS projects page.
Please have a look at http://wiki.phys.ethz.ch/readme/setting_up_a_new_d-phys-ubuntu_1204_linux_workstation
Login to the LTSP Server
ssh root@plimpy
Change the directory where the config files are
cd /pub/debian-local/configs/natty/plimpy/
Add the host with MAC address and the client settings (Windows login, German keyboard, screen resolution)
$EDITOR lts.conf
Activate the config file
dphys-config -f lts
Don't forget to set the default printer for the client, it works the same way as with the workstations.
Make sure you setup the host to netboot at MacAdm