An Organizer is a flat computer interface that can be input any information and can interface with other computer systems. Dot Matrix uses hers to keep track of all her business information as well as important information about Mainframe itself. It is password protected so that Dot is the only allowed to use it. After meeting Bob, Dot made the password "Guardian", but she revieled that password to Captain Capacitor, so it's probable that it has been changed since that time.