Poked through the internets and found out abit of information.
This is taken from the Symantac Support website.
"Using a network bootup
Symantec Ghost 7.0 and later can work with computers that do not have floppy disk drives when the computers are running Windows 2000 or Windows XP and have network interface cards that are PXE-enabled."
More detailed information is found here --> http://service1.symantec.com/SUPPORT/on-technology.nsf/docid/2000042011340125