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