A system interactively controlled by a TV viewer remote control transmitter displays portions of a scroll program guide on the. Further, methods of isolation of specific impurities of montelukast defined by formulae, ,, and analytic methods used for the control of the production of montelukast in the pharmaceutical quality. Each heat spreader has a proximal-to-heat-source section and a distal-from-heat-source section. The subsidiary lock device includes a driving section.