How to find out where grub is installed?

[Andras Simon]

I have F7 (and an unused XP) installed and I'd like to install
F10 without bothering F7. I have separate partitions for boot,
root, usr that I left empty for just this purpose when I installed
F7. From the recent "Grub and two distros" thread I
understand (or so I hope) that a good method to proceed is to
have grub installed in the respective Fedora versions' boot partitions,
and, additionally, in the drive's MBR, which will chainload these.

My first question is: how do I find out whether the present grub
is installed in the MBR or not. I'm guessing it's not, but how do
I find out?

grub.conf looks like this:

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,1)
#          kernel /vmlinuz-version ro root=/dev/sda6
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,1)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.23.17-88.fc7)
	root (hd0,1)
	kernel /vmlinuz-2.6.23.17-88.fc7 ro root=LABEL=root1 rhgb quiet
	initrd /initrd-2.6.23.17-88.fc7.img
title Fedora (2.6.23.15-80.fc7)
	root (hd0,1)
	kernel /vmlinuz-2.6.23.15-80.fc7 ro root=LABEL=root1 rhgb quiet
	initrd /initrd-2.6.23.15-80.fc7.img
title Fedora (2.6.23.14-64.fc7)
	root (hd0,1)
	kernel /vmlinuz-2.6.23.14-64.fc7 ro root=LABEL=root1 rhgb quiet
	initrd /initrd-2.6.23.14-64.fc7.img
title Other
	rootnoverify (hd0,0)
	chainloader +1

and the first few partitions are

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1275    10241406    7  HPFS/NTFS
/dev/sda2            1276        1288      104422+  83  Linux
/dev/sda3            1289        1301      104422+  83  Linux

sda2 is F7's boot partition, sda3 will hopefully be F10's.

Andras