(Sarah of the Clue Crew points her remote, first at you, and then at her digital camera.)  You don't see anything happening when you press your remote, but hold it up to a camera & you can see it's communicating to the TV using this spectrum of light
The way the Enterprise crew can encounter an alien spacecraft, "hail them 
on... [DOC] [TLE] But Not Simpler - Discover Magazine Blogs [PAR] Mar 23, 2014 ... What You Don't See Gives You Away ...