How can I unset my system without a tag/fob?

On some systems (usually police calling systems) you may have to use a tag or fob to unset the system instead of a code. This is to comply with the requirements of police policy and EN standards relating to the use of intruder alarm systems – if you do not have a tag or fob available, you will be unable to unset the system using a code until after the entry time has expired and an alarm has been generated