One way of dealing with this is to query the User regarding the source of the environmental light by {HEAD ~ a software application} operating at {TAIL ~ the host computer} coupled to the display 
operating at
One way of dealing with this is to query the User regarding the source of the environmental light by { HEAD ~ a software application } operating at { TAIL ~ the host computer } coupled to the display
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH