Install GAG boot manager to hdd without floppy/cd

[zaleschiemilgabriel]

Install GAG boot manager to hdd without floppy/cd (In Windows XP) - Does anyone know how to do that?
I can write up a program in FASM to change physical sectors on the HDD, but what do I put into the MBR? GAG's source code has an asm file called hdboot.asm, and I was planning to take a look at it so I can figure out what it does, and maybe compile it and then install it to my hdd, but I figure that's not enough, as maybe some other configuration data may be needed to be put somewhere else.

Thanks,
Gabriel