1. admin page
     session name at top
     grid statuses
     lamps-online are highlighted,
     lamps-notonline are dimmed (or hidden)

2. controller timeout
     lamp.rgb, lamp.lsa (last seen at), lamp.online=1/0
     walk through all lamps
     look at "last seen at"
     if timedout, mark "offline"

3. debug page: show sessions & lamps in sorted order

4. admin page: each lamp has a link to open that lamp on external window
     (smallish)