Hot Diggety! On a bright and sunny day, Sebastian Lederer was rumored to have said...
> 
>         boot enet:0
> 
> at the OF prompt.
> You can even specify the file to boot:
> 
>         boot enet:0,netbsd

YOWSA!!! *Thank you*! That did the trick. You really don't know exactly
how thrilled I am, because now this opens up a whole world of possibilities
for me :-)

I'll probably be reporting back at some point when I've had a chance to
look around the install more fully.

-Dan