A good way of looking at this feature Enrique is to compare it with a spam filter on your e-mail box.  If you have for example alarms that are constantly toggling on and off (e.g. due to a poor alarm threshold definition), or an alarm that re-occurs every day at around the same time, then those will be considered to be non-focus alarms after some time (i.e. you could have put your money down on the fact that they would occur).  By using this feature, operators can really filter out any clutter and focus on alarms that truly indicate an important operational issue.  Again, think of it as a spam filter.