> 	If you have very limited remote hands one fallback might be to
> 	post a bootable CD with a kernel configured with root on wd0 &
> 	get someone to put it in (obviously rewriting the kernel on
> 	the disk is first choice... but as a backup...)

Unfortunately, I didn't install a CD or DVD drive. It's a first generation 
iMac G3 motherboard in an 8" deep 1U rackmount case. It's very similar to 
this one:

http://winona.ziaspace.nl/

On the other hand, does anyone know if it's possible to boot from a USB 
drive on these older machines?

John