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Downloadable mobile applications for use in pre-populating forms with user and payment information; Downloadable mobile applications for use in single-sign on; Downloadable mobile applications for monitoring and operating residential and commercial building systems and devices; Downloadable mobile applications for enabling residents and others to control on-premises systems and devices, to communicate with other residents, building staff and others, to pay rent, and to book services and amenities; Downloadable mobile applications for home automation and home device integration; Downloadable mobile applications for providing an electronic personal assistant; Downloadable mobile applications for obtaining directory assistance, making personal arrangements, obtaining information to meet individual needs, scheduling appointments, arranging for transportation services, and arranging for other personal services; Downloadable mobile applications for enabling staff of residential and commercial buildings to grant access to residents and others to control on-premises systems and devices, to communicate with residents and others, to collect rent, to provide information to residents and others, and to allow residents and others to book services and amenities; Electric or electronic sensors for detecting and interpreting signals from networked devices, appliances, and household, industrial, and commercial building systems