>         ERROR! ERROR! ERROR! YOU SHOULD NOT BE HERE!!!
> 
> I've poked around in most of the obvious places (emacs sources, xterm
> sources, etc.), but as yet have not found where it could have come from.

Do you have some problem with grep(1)ing the executables?  This is
*not* a hard problem to solve.

find / /usr -xdev -type f | xargs grep -lo 'YOU SHOULD NOT BE HERE'

> Speaking of reboots -- I still seem to have to manually publish the arp
> entry for my diskless workstation else it can't seem to boot itself more
> than once.  It gets stuck with an "(incomplete)" entry.

This was allegedly fixed before 1.3 was released.  Are you sure you're
running the release version of rarpd?