An efficient generator of update packages employs a new command SET PTR CACHE to take advantage of a rudimentary caching mechanism that allows exploiting of local patterns in pointer replacements. The product tracking server also stores static reference data, pre-defined rules or queries, generates pre-defined messages for delivery to other business management systems, and responds to ad hoc, online user inquiries and tracking requests. The interior of the sleeve includes an epoxy and a catalyzing agent initially separated from one another, but mixed by kneading the sleeve. A first plurality of apertures is provided in the first outer annular wall in the substantially V-shaped throat region, and a second plurality of apertures is provided in the aft, axially extending portion of said second intermediate annular wall so that cooling air flows through the first and second pluralities of apertures to impingement cool the third radially innermost annular wall.