how is it done?
It is usually transmitted by medium such as electric current, radio waves, visible light, or sound waves.
Morse code
Morse code is usually transmitted by on-off keying of an information-carrying medium such as electric current, radio waves, visible light, or sound waves. 
what is freedom from want? It was also known as The Thanksgiving Picture or I'll Be Home for Christmas, is the third of the "Four Freedoms" series of four oil paintings who is the artist? Artist Norman Rockwell. where is he from? New York City where did he study? The National Academy of Design and  the Art Students League. where is the former located? New York City who founded it? Samuel Morse, Asher Durand, Thomas Cole, Martin E. Thompson, Charles Cushing Wright, Ithiel Town who was the first one? He was an American inventor and painter. what was his famous invention? Single-wire telegraph system, and was a co-developer of Morse code. when did he invent the former? UNANSWERABLE what does the 'code' refer to? A method used in telecommunication to encode texts in "dots" and "dashes"
wiki:25686398
Morse code [SEP] Introduction
Thus the most common letter in English, the letter "E", has the shortest code: a single dot. Because the Morse code elements are specified by proportion rather than specific time durations, the code is usually transmitted at the highest rate that the receiver is capable of decoding. The Morse code transmission rate ("speed") is specified in "groups per minute", commonly referred to as "words per minute". Morse code is usually transmitted by on-off keying of an information-carrying medium such as electric current, radio waves, visible light, or sound waves. The current or wave is present during the time period of the dot or dash and absent during the time between dots and dashes.