I found no examples using the " character, what could it be used for?
The double-quote character is used, e.g. on windows to enclose Path-Parameters, which contain blanks (or other WordDelim), to make sure, the whole thing is used, e.g. when passing to TProcess or reading ParamStr when started from commandline.
Nutshell: the double-quote-character is used to: "Everything between 2 Double-Quotes --> return it as one token"