Apparatus and methods for providing Rendezvous point Interpiconet Scheduling in an ad hoc polling based communication infrastructure such as a Bluetooth system in which a PMP node belongs to more than one piconet. The invention also relates to the preparation of these compounds, to pharmaceutical compositions containing a pharmacologically active amount of at least one of these novel hydronopol derivatives as an active ingredient, as well as to the use of these pharmaceutical compositions for the treatment of disorders in which ORL1 receptors are involved. The void space may be at least partially filled with an insulator lining. These values are passed to pan and tilt controlling co-processors which control servo-motors for pan and tilt operation. The algorithm receives the state of the display, and can optionally receive an ambient lighting value from an ambient light sensor and a user-selectable manual brightness adjustment setting to determine whether luminescence shock avoidance should even be triggered, and if it is triggered, how much should the brightness level of the display be limited.