There is provided an EL device sealing plate for which a drop in transparency is suppressed. The drive member is operatively connected to the reel to rotate the reel in a winding direction when the drive member is rotated in a raising direction, and to controllably rotate the reel andor permit the reel to rotate in an unwinding direction when the drive member is rotated in a lowering direction. A plurality of exercises are determined and the exercises are input into the computer to define the exercise routine specific to the user. The metro photonic switch introduces optical carriers that are all generated in the photonic layer adjacent to it and allocates them out to the photonic access nodes for modulation. The indexing mechanism of the present invention minimizes sticking of the splined pin during release and re-engagement. This improvement reduces or eliminates memory otherwise wasted on null pointers prevalent in sparsely populated andor unbalanced, wideshallow digital trees.