A heat-tolerant capillary seal for a burn chamber preferably includes a pass-through in an outlet of the burn chamber and an adhesion material in a gap between the pass-through and the interior of the outlet. The VCSELs can be spaced symmetrically or asymmetrical, in a manner to improve power or speed, or in phase and in parallel. The first locking mechanism locks the first member to the second member, and unlocks in accordance with pressure provided from external of the housing. In another embodiment, the identification and processing of mail occurs in an Identification Code Sorting system.