An "More..." (3) link allows the user to see which filters are installed
in each slot (if known), and also allows the user to reset the PLC.
The "Preferences" drop-down allows one to choose day-time or night-time modes, as well as whether to disable the tool-tips when one hovers over a button.
[[Image:filterwheel2a.png|The preferences drop-down]]
Note: the filter name and colour are obtained from a configuration