Its not as simple as using the boot from network option. The only thing i can suggest if you want to use your files is to use FTP, or a remote access utility.
ok, lets put it this way, say my old computer does not have a hard driv ein it, i want to boot the old computer, so its botting form my main computer, so everyhitng is form the main computer, when i do somthing on the old computer, its all saved on the main computer. this is done at my old high school were they had these wyse mini things in and a monitor, they had no hard drive and still botted windows form the server.