Install rwall-server if you'd like the ability to receive messages
from users on remote hosts.
-rwxr-xr-x 1 root root 1074 Sep 28 2001 /etc/rc.d/init.d/rwalld -rwxr-xr-x 1 root root 117728 Sep 28 2001 /usr/sbin/rpc.rwalld -rw-r--r-- 1 root root 1315 Sep 28 2001 /usr/share/man/man8/rpc.rwalld.8.gz ?rwxrwxrwx 1 root root 15 Sep 28 2001 /usr/share/man/man8/rwalld.8.gz