The Generator simply takes a list of SVG files and make a single sprite file from them using <symbol> elements.
The sprite will be created in the same folder as the svg files.
The ID for each symbol fit to the name of the file from which it was generated.
So if the file name is "ico-email.svg" then <symbol> id="ico-email"
The Viewer allows you to view all elements of the created sprite and copy the desired identifier.