The invention relates to novel imidazolamino compounds. The services can be dynamically changed or added to support heterogenous cluster management. The random walk can step from user to user or from user to item; when an item is reached, the node can be absorbing such that the random walk terminates. Subcarriers in which a secondary synchronization code is multiplexed are mutually separated and equally spaced. The probability distribution function is a normalized load duration curve that thus accounts for a varying set of \u201coperating states\u201d that may occur with respect to the set of access points.