A grating-outcoupled microcavity disk resonator has whispering gallery modes existing in a nearly circular resonator. The wideband antenna interposes a substance whose conductivity is about 0. A graphical image is displayed on the first client where a command is selected to markup the graphical image. The controller is configured to be located in the building, to communicate with the tracking device, to communicate with the system in the building, to determine an event that should be executed based on information received from the tracking device and a programmed event trigger. The user may specify tasks for the identified content andor access points. In a preferable embodiment, to achieve this, one driver or a group of drivers drives one logic level signal, while the other drivers drives the inverse to this signal.