A software system having a multi-layer architecture for controlling a hardware system including a latch layer, a hardware control layer, an access layer, and an orchestration layer. One embodiment has a connecting arrangement between the drive motor and the impeller that permits the two to be easily and quickly coupled and uncoupled. The tributary cards route operations, administration, and management traffic based on the subset of the routing information. Preferably, the release liners for the pressure sensitive adhesive are contact areas on the surfaces of the envelope or the lateral flanges coated or otherwise treated with a release agent.