A nonvolatile semiconductor memory recovers variation in the threshold of a memory cell due to disturbance related to a word line. A secondary reflector, composed of an elongated element with steps, runs along the extension of one of the flanges of the primary reflector, while an elongated transparent diffuser runs along the extension of the other flange. The electrode module is a laminate of a perforated epoxy foil and a photo-formed metal foil with sensor membranes deposited into the perforations. Access requests on the two ports and the refresh requests can be asynchronous. The nonreplicating vector may be formulated with a pharmaceutically acceptable carrier for in vivo administration to the host. The requests may be sent through a render or display path of the computing environment from one or more virtual machines, transparently with respect to the virtual machine monitor.