USB booting :: USB with no HD, CDROM or Floppy

Is it possible to trick a system into booting through USB if the BIOS doesnt support USB booting? I have a system that will not have a floopy, a cdrom or a harddrive. But it will have USB. If i have this system will the system pick up on the USB to boot DSL on? Or will it totally ignore the USB?

original here.