Disclosed is a canned pump comprising a housing, a rotor contained in the housing, a circuit substrate supported on the housing, semi-conductor means for power control attached to the circuit substrate, an end cover attached the housing to cover the circuit substrate, an a heat sink having heat radiating means for cooling the semi-conductor means for power control. A recipient receives the media item recommendation message which includes a media item identifier of a media item and presence information of a recommender of the media item in association with the media item identifier. A resilient limb cup for each limb seat has portions for engaging the bottom, side walls and inner end wall of a limb and a fastener extends from each limb through each limb cup and limb seat to secure the limb to the damper. A communications configurer is configured to track one or more communication attributes of broker systems and changes thereto to ensure communications between the resource management systems are broker systems are conducted in accordance with the communication attributes of the broker systems. In some embodiments a plurality of carriers are used in addition to a plurality of different polarization direction antennas.