A communication system, such as a wireless CDMA system, detects markers with fewer errors by having field units transmit the markers at different power levels. The communication path between the user device and the communication network is selected based on available resources of the two or more wireless routers. The invention furthermore relates to an apparatus comprising a catalyst module having an open volume of at least 60% and means for contacting liquid sulfur with a stripping gas to carry out said process. Still others concern metadata generation, processing, and representation.