yppasswd on SUNs?

[Peter Clitherow]

I have a need to develop a yppasswd interface for a non-SUN machine
(specifically, a LISP Machine), and not being a Unix or SUN wizard, cannot
find where the details of the yppasswd protocol is documented.  Can some
kind soul enlighten me?  I believe, that is i ask on TCP/UDP socket 111
(port mapper) for the socket that yppasswd uses, then i can use this to
authenticate a login from a yp server of some kind.

Or is there an easier way to do all this?

Peter Clitherow, Bellcore,
  444 Hoes Lane, Room 1H-213,
  Piscataway, NJ 08854