Every modern alarm system incorporates the so called silent update feature. This feature may be used via the following ways :
i) silent panic button : usually installed under shop counters (in case we are in a business environment) or inside home bedrooms etc. If pushed, a signal is send even if the alarm is not armed.
ii) threat password : we may use this password instead of our standard one, if there is a burglar in our place asking us to disarm the alarm. By typing the threat password the alarm is disarmed but a signal is sent to the signal receiving centre.