A method and system for brokering frequencies for use in peer-to-peer communication sessions. The invention further relates to the use of a compound of formula as a ligand for the preparation of a metal complex useful as a chiral catalyst in asymmetric catalysis, and to the chiral metal catalysts comprising at least one ligand of formula. A processor for connection of the stimulating pulses to andor from one or more spread spectrum transmitter-receiver circuits andor from a signal processing network for receiving said stimulation pulses and for providing cross-correlated in-phase and quadrature-phase baseband signals. The material may be poured if it is in a fluid condition, or, if it is thermoplastic, it may be introduced in the form of a preformed piece which is superficially melted to bond it to the glazing profile. In one example, a catheter includes a fluid exchange portion and a member attached to the fluid exchange portion for biasing fluid flow at the treatment site. Also, a system for automated concrete structural member fabrication, including a concrete mixing system, a concrete delivery subsystem, a block transport subsystem, and a number of casting machines, each casting machine having a self-releasing mold for fabrication of precast concrete structural members.