A method for wirelessly controlling a working device for the treatment of air by use of a handheld unit , said method comprising: - directly integrating an embedded web service technology into the working device providing an entirely virtualized control dashboard of the working device; - connecting said working device to a central server via a network, wherein said working device is uniquely identified on said network by an assigned network address, and further wherein said working device and said central server are configured so that said central server can receive data concerning operation of said working device, and control operation of said working device, via said network; - affixing a QR code label with a machine-readable device-specific identification marker on the front of said working device, wherein said device-specific identification marker identifies the working device and the assigned network address of said working device; - scanning said device-specific identification marker on said QR code label affixed to the front of said working device with said handheld unit , whereby to identify said working device and said assigned network address linked to said working device, and automatically directing the handheld unit to the central server so as to establish a link between the handheld unit and said working device via the central server in order to display information about the working device on the handheld unit ; and - using said handheld unit to cause said central server to communicate with and control said working device at said assigned network address, whereby to allow the user to control operation of said working device via the virtualized dashboard of the working device linked up directly to the handheld device screen. - directly integrating an embedded web service technology into the working device providing an entirely virtualized control dashboard of the working device; - connecting said working device to a central server via a network, wherein said working device is uniquely identified on said network by an assigned network address, and further wherein said working device and said central server are configured so that said central server can receive data concerning operation of said working device, and control operation of said working device, via said network; - affixing a QR code label with a machine-readable device-specific identification marker on the front of said working device, wherein said device-specific identification marker identifies the working device and the assigned network address of said working device; - scanning said device-specific identification marker on said QR code label affixed to the front of said working device with said handheld unit , whereby to identify said working device and said assigned network address linked to said working device, and automatically directing the handheld unit to the central server so as to establish a link between the handheld unit and said working device via the central server in order to display information about the working device on the handheld unit ; and - using said handheld unit to cause said central server to communicate with and control said working device at said assigned network address, whereby to allow the user to control operation of said working device via the virtualized dashboard of the working device linked up directly to the handheld device screen. <EOS>