yppoll asks a NIS server process for the order number and which host is the master server for
mapname.
The options are as follows:
-T
Use TCP protocol instead of UDP for request if -h option is present.
-h host
Ask the NIS server process running on
host for information about
mapname. If
host is not specified, the server polled is the default server returned by
ypwhich(1).
-d domain
Use the NIS domain
domain instead of the default domain as returned by
domainname(1).