There is no fourth drive anywhere to be found. I have two hard disks. And an external drive via USB. That's it. I still don't believe that the few times I booted a PCLOS 2011 live CD it was showing the two installed hard disks flipflopped but it did. BBL
OK, it worked. I am here. 
So now, what to do to put grub right from here? Rather than from the other install? I can just make it the default from there I suppose but that would be too easy 
You can choose any hard drive to be the boot drive. You need to decide which OS should be the one with the
master grub, then install grub to the
MBR of the
same drive it resides on and set that drive as the
boot drive in
BIOS. Your boot stanza in the
master menu.lst should then point to
(hd0,n) with
n being the partition number, counting from
0.
When you install any
additional OS, install that installation's grub to the
PBS (
Partition Boot Sector) of its
/ partition, then either copy the
first boot stanza from its
menu.lst to the
master menu.lst of the
original installation. Alternately, you can just write a
chainload stanza for the new installation in the
master menu.lst If the new installation is on a different drive, the stanza you write or copy must be written or edited to look for the kernel and initrd image on
(hd1.n). If you install grub to a
partition, during the initial installation, you will be asked which drive you
actually boot from, and if you give the
correct answer, this will already be taken care of.
You can use the
grub native install method to choose
which installations grub will be the
master grub. You can do this from the
installed system or a
liveCD. The instructions are the
same for either.
http://www.pclinuxos.com/forum/index.php/topic,62786.msg508062.html#msg508062