A method and system for message passing which weights messages in a queue by urgency of consumption. The guide system comprises a first alignment pin, a second alignment pin and a wire saw. A second patterned mask layer is then formed on the dielectric layer along a second direction which intersects with the first direction. The cargo box also may comprise a plurality of hinge-latch members to connect the lid portion to the bottom portion adjacent each lateral side. The second member is formed to define dual vortex chambers at the upstream section in which the fluid is directed to flow in vortex patterns prior to being permitted to flow through the clearance gap area.