Build Server - Installing GRUB for another machine

[JL]

Hi,

I have a hard disk attached via an IDE to USB adapter, currently
appearing as /dev/sda, on which I am building my new system, in a
chroot'd environment.

I intend to remove this drive, and add it into a different computer,
where it will become /dev/hda. This other machine can boot only from
the hard disk - no other bootable media is available, even another
hard drive (yep, an old laptop).

I can't quite seem to get my head around how to get GRUB to install -
mostly at which point do I use which systems reference to the names.

I *think* I want to have a device.map for the *target* system by
*host* system name (i.e. "(hd0) /dev/sda"), and then install to (sd0),
err... and now I am lost.

Can this be done? Preferably without destroying the host systems
ability to boot...

P.S. the wiki (grub.enbug.org?) seems to be down?
--
JL