Communication between clusters of processing nodes is initiated by designating a link layer address and a target node name in a remote cluster. An exemplary diode comprises: a light emitting or absorbing region having a diameter between about 20 and 30 microns and a height between about 2. At the end of counting by the counter 107, the value of the register 103 and the value of the register 105 are summed to provide a next address. The bundle of tubes can have at least one grid-like securing structure which supports the bundle in the housing. The steps of analyzing and grouping the sub-domains are repeated until the grouping approaches a box comprising the entire domain, and that the domain interactions between every sub-domain have been analyzed.