Dual booting: Ubuntu LTS and openSUSE 12.1

[LinuxIsOne]

Hi,

I am going to dual boot the following two:

Ubuntu LTS 10.04 Lucid Lynx i386 (32 bit)
openSUSE 12.1 x86_64

Said that, hard disk capacity is 250 GB
Processor supports 64 bit
RAM 2 GB

Currently: All back up taken, entire disk ready for play

Now, doubts:

Can one please elaborate in details about the above? The querries:

1. Ubuntu LTS has GRUB 2 while openSUSE 12.1 has GRUB LEGACY (GRUB 1), so
which to install first so that the main boot loader works according to
that...?

2. Suppose I install Ubuntu first, should I make 3 partitions as follows:

/root
/boot
/swap

3. Editing /boot/grub/menu.lst file through Ubuntu LTS would make changes
in the file of menu.lst of openSUSE too? Or how would it work....

Can one explain these confusing geeky matter....?

Thanks.
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