Users must validate their email by clicking a link in an email they have received. This way, Alarmhandler knows the user has access to the email address. User's with validated email can invite other users to the system. If you enter your address in Alarmhandler whilst you're at your estate, Alarmhandler can validate your address using geo-positioning. For users with validated physical address, neighbourhood watch features in Alarmhandler will be opened, eg. you can see other people on the road or in the appartment building who are offering to be "neighbourhood helpers".