How to boot Windows 2003 server from a My Book World Edition?

Hi all. I would like to know if there is a method to boot a PC from a WD My Book World Edition?

WD support says it may be possible to boot from an external HDD, but the DON’T provide support for that!

I have a Wi-Fi LAN of 5 PCs. One of the 5 PCs runs windows server 2003, and its latest SP is installed, also runs X2 thin client AS, and X2 thin client server. The rest are running X2 thin client.

I want to remove all the internal HDDs from all PCs including server to create a disk-less environment.

How to make the Wi-Fi based LAN PCs boot from the WD my book world edition. All PCs BIOS can boot from LAN, or USB.

Thank you.