An emitter of a heterojunction bipolar transistor has a double-layer protrusion formed of a first emitter layer and a second emitter layer and protruded outside an external base region. A print program processes a markup language, for example, an extensible Markup Language or a Standard Generalized Markup Language message in order to print an indicium or indicia received from the central server. The result is that the list of probable sequences have unique sets of bits in the first portion. The plugin is adapted to extend an instant messaging application installed on the requesting device. The production of cold is made possible by further expansion of the working fluid in a subsequent, secondary expansion unit, by which the temperature of the working fluid can be made to be significantly below the ambient temperature.