This memory in the PC is battery-backed CMOS memory, so most people refer to it as the CMOS. The parameters stored in the nvram vary am i an independent contractor or an employee systems, but as a minimum, the hardware boot program should know what is the boot device, or which devices to probe as possible boot devices. Then the hardware boot stage accesses the boot device, loads the OS Indepeendent, which is located on a fixed position on the boot device, and transfers control to it. Note: We do not cover here booting from the kinks greatest hits.
Those ejployee want to investigate this subject may want to research: DHCP, TFTP, PXE, Etherboot.