I found this in my help files. What does it mean? Why is it there?
vim:tw=78:fo=tcq2:isk=!-~,^*,^\|,^\":ts=8:ft=help:norl: 
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1 Answer
That's a "modeline", a feature of Vim. If it encounters such a line in the first or last 2 lines of a file, Vim reads settings from it and applies them to the current buffer.
Example: Forcing a file with extension .rdf to be handled as file type xml:
<!-- vim: ft=xml --> <!-- rest of file -->