Detect if it's lilo boot loader or grub?

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http://unix.stackexchange.com – Without rebooting, is it possible to tell if the boot loader currently present was LILO. GRUB 0.97 or GRUB 1.9X? I was thinking about reading MBR, but not sure about it. Just by checking the files on system, i.e /etc/lilo.conf doesn't testify anything Any ideas? (HowTos)