Send a Break Message to the Active Work Stations. The system supported SNDMSG
command can send to all active users, but it cannot force a break message. The
system supported SNDBRKMSG function can send a message to all workstations and
will cause a break on those that are active. However, the users that are not
signed on will see the message when they do signon. OA supports a similar
function, but it is not a command.