This is my original file.  It is in the "main" buffer.
The main buffer is always named the same as the file you
are editing, in this case "helpexample.mss".  While I was
editing this file, I asked for help with the C-h command.
I asked for all information about commands that have to do with
buffers using the "apropos" help option:  C-h a, followed by
the word "buffer".  GNU Emacs showed me what it found by creating
a new buffer called "help", dividing the screen into two windows
and putting the text in the second window.