Erlang bytecodes and/or VM description?

[Richard A. O'Keefe]

	You'll have to write 
		erlc +'S' mod.erl

	And also to remember that the qutes need to be escaped, so the working
	comand line is:
		erlc +\'S\' mod.erl
	
How is

    erlc +"'S'" mod.erl

different from

    erlc -S mod.erl

(except for being harder to type)?