Boot Manager question

[FreeBSD MailingLists]

I have a duel boot system setup with the Freebsd Boot Manager in the MBR.
Is there anyway to change the default boot selection from with in the
FreeBSD environment?
What I mean is, if I am remotely accessing my dual boot FreeBSD box,
and I want it to boot into the other OS, is there a command that
allows me to change the next boot to be the other OS?

TIA,
Tomoki