Additional information:

After adding a new client, (if PXE network booting and Wake-On-LAN are activated in the client's BIOS) the client will boot over the network and runs through a hardware detection sequence. Hardware data (hard disk size, partitions etc.) will be sent to the server. When the data transfer is finished the client will change its status to ”yellow”. You can setup your client now. To setup your client click on ”Clients” $\rightarrow$ ”Setup” in the menu.
Please note that the client needs to be connected to a wired network. Wireless connections cannot be used to install the operating system.