Setup a syslogd configuration that logs to a user.
Login to two different ttys on machine, use 'logger' to
send distinct message to the facility that logs to the user.
Verify that both logins receive the messages.
Use 'mesg n' to turn off messages to the first user. Verify that
the syslog daemon only writes to the second user (mesg y).
Use 'mesg y' to back on messages to the first user. Use 'mesg n'
to turn off messages to the second user. Verify that only
the first user now receives messages.