That is, all messages mirrored on the root terminal, or some
indication that messages are being sent and to whom?
Better, yet: could could all use of these and similar commands be
denied except on a per-usage basis? i.e.: user1 enters "write user2"
and root is notified and must enable user2 to recieve the message
before user1 may proceed.
And one step further: root decides user3 should also see the message
and causes it to be written to their terminal also?
If so, how?