Copying self - booting Cds (best program?)

I use nero to burn normal backups with no problem on my phillips rw 400 series drive.(4x4x16x) I also have no problem producing boot cd's from an image i ontained from the web. However, I have no idea how to copy self - booting cd's. What is the easiest, most sucessfull way to do it and what program should I use to do it? Please help me out!!!!