This button should only be used in extreme circumstances. It will delete the card holder from the list and from the door controller. If the card is used at a later date it will be presented on screen as an unknown card. A better alternative is usually to disable the card holder (see Disable Card Holder).
To delete a card
- Select the Card Holder in the list in the Card Holders window
- Click the delete card holder button
- You will notice that the line in the list is removed.