headless dual boot

[Jason DeVita]

A friend wants to install YDL on a mac.  It has no monitor, it's basically
used as a server.  So the question is, how would she choose which OS to
boot (since she would be rebooting remotely)?  One idea I came up with, is
to write a script that modifies yaboot.conf, runs ybin, then reboots.
That works fine for changing from linux to OSX; but then she's stuck --
there's no way to get back.  Another idea is to set the timeout in yaboot
to something long, and attach a keyboard to the machine.  Then she could
just hit 'l' or 'x' after a sufficiently long time.  That's kind of
unsatisfactory, though.

Anyone know a way to do this?

Thanks,
J