This list of responsible being attached to alarm message strings will be great for the 
mmessenger, however, perhaps its going to generate very long messages for the speaker programs 
(web interface and mlxspeaker ):

AlarmClass : AlarmMessage (ResponsibleUser1 ResponsibleUser2 ResponsibleUser3 ResponsibleUser4 
... ResponsibleUser4)

especially if people put in user tags or emergency contact details...

Should we add a key word or character for the programs that create audio to parse that silence 
the list of responsible users? I'd be tempted to use a single character but there is a risk 
users might have that in a custom alarm message. Maybe something usual like the 'bel' 
character? '|'? 

Perhaps use the string 'Responsible:' or 'Users:' to trim out the Users Responsible list from 
the message string?

AlarmClass : AlarmMessage Responsible:(ResponsibleUser1 ResponsibleUser2 ResponsibleUser3 
ResponsibleUser4 ... ResponsibleUser4)

AlarmClass : AlarmMessage Users:(ResponsibleUser1 ResponsibleUser2 ResponsibleUser3 
ResponsibleUser4 ... ResponsibleUser4)