RemoteBoot
by Volker Weber
Stefan Rubner has written a really nice tutorial on how to set up a remote boot for your clients:
With many of the new PCs not being equipped with a floppy drive anymore, there's a chance that a situation will come up where you need to boot the machine from a remote boot image. Reasons may be that your optical drive is broken or - like in my case - the computer in question neither has a floppy nor an optical drive at all and you need to rescue some data from the broken hard drive or you just want to reinstall from a previous backup image.